All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. Titanium can be used in surface condensers. The chemical symbol for Actinium is Ac. The information on this site has been compiled from a number of sources. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). The chemical symbol for Uranium is U. 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. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. 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. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. Electron Configuration: [Rn]7s 2 5f 2 6d 1: Total Isotopes: 32: ... Protactinium has 20 isotopes, the most common of which is 231Pa with a half-life of 32,700 years. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. The particular isotope they found, protactinium-234 m, has a half-life of about 1.17 minutes.They named the element brevium, meaning brief, and then continued with their studies. In the periodic table, potassium is one of the alkali metals. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. An element that is not combined with any other different elements has an oxidation state of 0. The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. The chemical symbol for Protactinium is Pa. Electron configuration of Protactinium is [Rn] 5f2 6d1 7s2. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Atomic Radius: Atomic Volume: 15cm 3 / mol. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. 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. It is one of the least reactive chemical elements and is solid under standard conditions. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. Prairie Dogs: A Threatened Species or Public Health Nuisance? Thulium is an easily workable metal with a bright silvery-gray luster. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. Pure germanium is a semiconductor with an appearance similar to elemental silicon. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Atomic Structure of Protactinium. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. When an electron is added to a neutral atom, energy is released. The chemical symbol for Promethium is Pm. Protactinium Properties. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. Most elements have more than one possible oxidation state. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Gold is a transition metal and a group 11 element. Electron configuration 5f 2 6d 1 7s 2: Electrons per shell: 2, 8, 18, 32, 20, 9, 2: Physical properties; Phase at STP: solid: Melting point: 1841 K (1568 °C, 2854 °F) Boiling point: 4300 K (4027 °C, 7280 °F) (?) The name "protactinium" comes from adding the Greek protos meaning first, before the word "actinium." Actinium is a soft, silvery-white radioactive metal. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. Each shell and subshell have a limitation on the amount of electrons that it can carry. The chemical symbol for Samarium is Sm. Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. The chemical symbol for Astatine is At. The chemical symbol for Antimony is Sb. www.nuclear-power.net. Thorium is moderately hard, malleable, and has a high melting point. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Protactinium has an atomic mass of 231.03588 u. A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page. Pseudoscience: A Threat to Our Environment, Clean Air Act Contributing to Mercury Problem, The Heat facing Outdoor Wood Furnaces & Boilers, Increased Mercury Levels Attributed to Industrial Activities, Environmental Pollution of the Concord River, Plastics - From Recycling Bin to New Product, RoHS: Europe's Initiative to Control Technological Waste, The Chemistry of Polychlorinated Biphenyls, Molar Mass Calculations and Molecular Weight Calculator, Stoichiometry: Molarity, Molality and Normality, What You Do and Don't Know About Fluorine, USDOT HazMat Placards CD & training modules, J.K. Barbalace, inc., website development, Plagiarism, Copyright Infringement and Fair Use, Kitchen Renovation - Coming in 2010 or 2011, Prairie Dogs: Small mammal, big controversy. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Protactinium is one of the rarest naturally occurring elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. The chemical symbol for Copper is Cu. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. 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. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Uranium is a silvery-white metal in the actinide series of the periodic table. Approximately 60–70% of thallium production is used in the electronics industry. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. 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 number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. Electron Configuration: 1s 2 2s 2 p 6 3s 2 p 6 d 10 4s 2 p 6 d 10 f 14 5s 2 p 6 d 10 f 2 6s 2 p 6 d 1 7s 2. For questions about this page, please contact Steve Gagnon. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. Protactinium was first identified by Kasimir Fajans and O.H. Nevertheless protactinium also shows a strong horizontal analogy with thorium and uranium in also displaying the +4 oxidation state, something that Mendeleev does not seem to have anticipated. The chemical symbol for Silver is Ag. We are a great educational resource! Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. The chemical symbol for Terbium is Tb. Crystal Structure: Orthorhombic. The chemical symbol for Selenium is Se. It decays by alpha-emission. Use online or print pages out as classroom handouts. Under standard conditions, it is the lightest metal and the lightest solid element. Compact Fluorescent Lights (CFLs): Are They Worth the Switch? Tellurium is far more common in the universe as a whole than on Earth. Density (near r.t.) 15.37 g/cm 3: Heat of fusion: 12.34 kJ/mol : Heat of vaporization: 481 kJ/mol : Atomic properties; Oxidation states Prairie Dog Control: Non-Lethal Techniques. It occurs in all uranium ores to the extent of 0.34 part per million of uranium. Its existence was predicted by Russian chemist Dmitry Mendeleyev in his 1871 The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. In nuclear reactors, promethium equilibrium exists in power operation. The chemical symbol for Zirconium is Zr. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. The esti… 2) You may not distribute or commercially exploit the content, especially on another website. The element is superconductive below 1.4K. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. The chemical symbol for Boron is B. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Although neodymium is classed as a rare earth, it is a fairly common element. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. The electron configuration of protactinium is [Rn] 7s25f26d1. The chemical symbol for Erbium is Er. Tellurium is chemically related to selenium and sulfur. However, the metal is dangerous to handle because it and its compounds are both toxic and radioactive. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Thorium - Electron Configuration and Oxidation States - Th, Actinium - Electron Configuration and Oxidation States - Ac, Radium - Electron Configuration and Oxidation States - Ra, Thorium – Electron Configuration and Oxidation States – Th, Uranium – Electron Configuration and Oxidation States – U. Pure radium is silvery-white alkaline earth metal. The maximum electrons that can be carried by the sub-shell S is 2, by P is 6, by D is 10, and the F sub-shell can carry 14. Cerium is the second element in the lanthanide series. Similarly, the p block are the right-most six columns of the periodic table, the d block is the middle 10 columns of the periodic table, while the f block is the 14-column section that is normally depicted as detached from the main body of the periodic table. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. If you need to cite this page, you can copy this text: Kenneth Barbalace. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Lawrencium is the final member of the actinide series. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The mean radius of protactinium is 180 pm. The chemical symbol for Lithium is Li. Lead is a heavy metal that is denser than most common materials. Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of protactinium-231 (atomic number: 91), the most stable isotope of this element. Thomas Jefferson. The chemical symbol for Dysprosium is Dy. Looking Good, Feeling Bad; or, What's the Problem with Perc? 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. - How to read an electron configuration chart - A list of who discovered each element. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. The chemical symbol for Polonium is Po. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. Purposes only stable isotopes, of which are colored 10 protons and electrons. 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