It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. Uranium has the highest atomic weight of the primordially occurring elements. The chemical symbol for Chromium is Cr. The Cookies Statement is part of our Privacy Policy. Potassium metal reacts rapidly with atmospheric oxygen to form flaky white potassium peroxide in only seconds of exposure. The chemical symbol for Rubidium is Rb. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. Number of orbit in argon = 3. - 25861540 The chemical symbol for Praseodymium is Pr. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. The chemical symbol for Berkelium is Bk. The chemical symbol for Oxygen is O. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. The chemical symbol for Copper is Cu. follow the link. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Tungsten is an intrinsically brittle and hard material, making it difficult to work. 2. Nickel is a silvery-white lustrous metal with a slight golden tinge. The periodic table is a tabular display of the chemical elements organized on the basis of their atomic numbers, electron configurations, and chemical properties. A step-by-step description of how to write the electron configuration for Potassium (K). Possible oxidation states are +1. The chemical symbol for Silver is Ag. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Cerium is also traditionally considered one of the rare-earth elements. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. The chemical symbol for Krypton is Kr. For "K" and "Ca" specifically, their 3d orbitals are currently higher in energy than the 4s. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. 4s 1 and the term symbol is 2 S 1/2 . Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. The chemical symbol for Palladium is Pd. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. The chemical symbol for Lead is Pb. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. The chemical symbol for Zinc is Zn. The chemical symbol for Arsenic is As. Multiple-site search is loading. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. The chemical symbol for Nickel is Ni. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. The chemical symbol for Boron is B. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Electronic configuration, also called electronic structure, the arrangement of electrons in energy levels around an atomic nucleus.According to the older shell atomic model, electrons occupy several levels from the first shell nearest the nucleus, K, through the seventh shell, Q, farthest from the nucleus. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Under standard conditions, it is the lightest metal and the lightest solid element. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. Electron Configuration Chart for All Elements in the Periodic Table. The portion of Potassium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Ar]. The chemical symbol for Gold is Au. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. Knowledge of the electron configuration of different atoms is useful in understanding the structure of the periodic table of elements. Only about 5×10−8% of all matter in the universe is europium. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. It connects the potential energy of the interaction of the nucleus and electrons, as well as the magnitude of repulsion between particles having an equal charge. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. How many valence electrons does it have? In writing the electron configuration for Potassium the first two electrons will go in the 1s orbital. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. The chemical symbol for Uranium is U. For these elements, the electron energy order and filling order may at first seem unusual. The chemical symbol for Curium is Cm. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. al. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. and the term oxidation number is nearly synonymous. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. A change like this, where an electron is lost, is an example of oxidation. 10XX,52,11XX,17,12XX,7,13XX,4,15XX,16,3XXX,2,40XX,10,41XX,12,43XX,5,44XX,4,46XX,5,47XX,3,48XX,3,5XXX,23,6XXX,3,71XX,1,8XXX,22,92XX,5,93XX,1,94XX,4,98XX,2,AISI,66,ASTM,171,Atomic-Mass,327,Atomic-Number,436,Atomic-Radius,86,Atomic-Symbol,329,Atomic-Volume,94,Austenitic,56,Boiling-Point,94,CBS,6,Chemical-Elements,100,Chemical-Symbol,217,CMDS,13,Coefficient-of-Thermal-Expansion,85,Covalent-Radius,87,Crystal-Structure,109,CS,17,CVS,3,Density,309,Duplex,6,Elastic-Modulus,30,Electrical-Conductivity,79,Electro-Affinity,87,Electron-Configuration,109,Electronegativity,102,Electrons-per-Shell,112,Enthalpy-of-Fusion,93,Enthalpy-of-Vaporization,95,Ferritic,12,Group-Number,218,HCS,14,Heat-of-Fusion,87,Heat-of-Vaporization,85,HMCS,16,Ionic-Radius,78,Ionization-Energy,102,Ionization-Potential,101,LCS,21,List,281,Martensitic,6,MCS,17,MDS,14,Melting-Point,96,MS,4,NCMDBS,6,NCMDS,31,NCS,2,NMDS,8,Oxidation-States,104,Period-Number,107,Properties,40,RCLS,1,RCS,16,RRCLS,3,RRCS,4,SAE,201,Site,2,SMS,5,Specific-Gravity,83,Specific-Heat,92,Specific-Weight,1,SS,80,Tests,2,Thermal-Conductivity,105,Valence-Electrons,98. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Since the 3s if now full we'll move to the 3p where we'll place the next six electrons. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Its extreme rarity in the Earth’s crust, comparable to that of platinum. The chemical symbol for Cerium is Ce. The chemical symbol for Radium is Ra. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. The chemical symbol for Iron is Fe. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. Potassium atoms have 19 electrons and the shell structure is 2.8.8.1. what is the electron configuration for potassium atomic number 19 )? Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. We use cookies to ensure that we give you the best experience on our website. It is occasionally found in native form as elemental crystals. The chemical symbol for Aluminum is Al. It is even less abundant than the so-called rare earths. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). The chemical symbol for Helium is He. The chemical symbol for Erbium is Er. Tellurium is chemically related to selenium and sulfur. Although neodymium is classed as a rare earth, it is a fairly common element. The electron configuration for a ground-state potassium atom is 1s22s22p63s23p64s1. Thallium is a soft gray post-transition metal is not found free in nature. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. Electronic configuration of Potassium (K) Atomic number of potassium = 19. Astatine is the rarest naturally occurring element on the Earth’s crust. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. The chemical symbol for Potassium is K. Electron configuration of Potassium is [Ar] 4s1. Nickel belongs to the transition metals and is hard and ductile. Discoverer: Davy, Sir H. and Thénard, L.-J. The chemical symbol for Caesium is Cs. The chemical symbol for Bismuth is Bi. © 2014 Wayne Breslyn,Method 2: Using the Electron Config. ... Chemistry Electron Configuration Electron Configuration. Titanium can be used in surface condensers. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. The chemical symbol for Sodium is Na. The chemical symbol for Rhodium is Rh. Its properties are thus intermediate between those of chlorine and iodine. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. The chemical symbol for Neon is Ne. Krypton is a member of group 18 (noble gases) elements. The electronic configuration of potassium (K) is 2,8,8, 1 instead of 2,8,9 though - 31893201 The electronic configuration of potassium (K) is 2,8,8, 1 instead of 2,8,9 though the M shell can accommodate up to 18 electrons. Lead is a heavy metal that is denser than most common materials. Because there is no need for potassium or calcium to use 3d orbitals, which would have contained up to 10 remaining electrons in the M "shell". Oxidation states are typically represented by integers which may be positive, zero, or negative. 2) You may not distribute or commercially exploit the content, especially on another website. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. The chemical symbol for Technetium is Tc. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. The chemical symbol for Promethium is Pm. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. The chemical symbol for Hafnium is Hf. The electronic configuration of potassium is [Ar] 4s1. In the case of Potassium the abbreviated electron configuration is [Ar] 4s1. Githy.com. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The chemical symbol for Neptunium is Np. Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. In writing the electron configuration for lithium the first two electrons will go in the 1s orbital. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. The chemical symbol for Scandium is Sc. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. Thorium is moderately hard, malleable, and has a high melting point. In the periodic table, potassium is one of the alkali metals. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. Its boiling point is the lowest among all the elements. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Since, maximum number of electrons in outermost orbit will not be more than 8, thus the 19 th electron of potassium atom will reside in 4 th orbit. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. The chemical symbol for Antimony is Sb. Gold is a transition metal and a group 11 element. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Lead is widely used as a gamma shield. The chemical symbol for Mendelevium is Md. The current IUPAC Gold Book definition of oxidation state is: “Oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds…”. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The chemical symbol for Gadolinium is Gd. The ions formed have a stable electronic structure, like a noble gas from Group 0. In nuclear reactors, promethium equilibrium exists in power operation. Approximately 60–70% of thallium production is used in the electronics industry. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Most elements have more than one possible oxidation state. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. The chemical symbol for Holmium is Ho. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. The chemical symbol for Einsteinium is Es. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. The chemical symbol for Molybdenum is Mo. There are 118 elements in the periodic table. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. Zirconium is widely used as a cladding for nuclear reactor fuels. Uranium is a silvery-white metal in the actinide series of the periodic table. Therefore number of electrons = 19. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. What is the electronic configuration of potassium ? Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. 1 Answer Truong-Son N. Jul 25, 2017 Major advantage of lead shield is in its compactness due to its higher density. The chemical symbol for Strontium is Sr. Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Here is a table of the electron configurations for elements 19-36, the fourth row of the periodic table. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. Potassium is a chemical element with the symbol K (from Neo-Latin kalium) and atomic number 19. The transition elements scandium-zinc are shown in pink. The chemical symbol for Osmium is Os. Holmium is a relatively soft and malleable silvery-white metal. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. This is a good question. The chemical symbol for Indium is In. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Einsteinium is the seventh transuranic element, and an actinide. Our Website follows all legal requirements to protect your privacy. Cerium is the second element in the lanthanide series. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. The chemical symbol for Platinum is Pt. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Home Money Science & Tech U.S. World Environment Page-of-the-day Trivia Potassium (K), Electron Configuration: [Ar] 4s 1 [Ar] 4s 1::: example of: Concise Form of Electron Configuration … In the periodic table, the elements are listed in order of increasing atomic number Z. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. © 2019 periodic-table.org / see also Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. If you don’t have a chart, you can still find the electron configuration. It is the heaviest essential mineral nutrient. Technetium is the lightest element whose isotopes are all radioactive; none are stable. The noble gas shorthand configuration is [Ar]4s1. Radon is a radioactive, colorless, odorless, tasteless noble gas. Holmium is a part of the lanthanide series, holmium is a rare-earth element. to add to c4m's excellent post, it's called the aufbau principle if you want to look into it more. Potassium is used as a heat transfer medium. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. The chemical symbol for Fermium is Fm. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. Chlorine is a yellow-green gas at room temperature. The chemical symbol for Titanium is Ti. The chemical symbol for Calcium is Ca. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Chemically, indium is similar to gallium and thallium. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. So the electron configuration of potassium will involve 19 electrons. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Neptunium metal is silvery and tarnishes when exposed to air. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Each element has a unique atomic structure that is influenced by its electronic configuration, which is the distribution of electrons across different orbitals of an atom. Potassium's atomic number is 19. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Neptunium is the first transuranic element. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. [Xe] 6s2 for barium). Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Are 31 protons and 13 electrons in the atomic structure when M shell can have -... ) elements sulfide mineral stibnite, indium is similar to gallium and thallium you the technical... Lustre, it is the third member of the actinide series of the group chemically! The densest naturally occurring potassium is [ Ar ] 4s1 protons and 77 electrons the. 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