Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Europium is one of the least abundant elements in the universe. Krypton is a member of group 18 (noble gases) elements. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Global Trends in Energy Technology Innovation, Hydrogen Fuel Cells: Energy of the Future, From Bhopal to Hazardous Waste Compliance, Love Canal NY: Grownups Don't Do Blue Goo, New Orleans, Hurricane Katrina & the Oil Industry, Environmental Justice and the NIMBY Principle. 5f2. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. 1) You may use almost everything for non-commercial and educational use. PLEASE, if you like an article we published simply link to it on our website do not republish it. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. So, protactinium is more dense and rigid than thorium but is lighter than uranium, and its melting point is lower than that of thorium and higher than that of uranium. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. 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. is a rare earth element with a metallic silver luster. Knowledge of the electron configuration of different atoms is useful in understanding the structure of the periodic table of elements. We use cookies to ensure that we give you the best experience on our website. The chemical symbol for Gadolinium is Gd. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Nickel is a silvery-white lustrous metal with a slight golden tinge. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. In the case of Protactinium the abbreviated electron configuration is [Rn] 5f2 6d1 7s2. The chemical symbol for Terbium is Tb. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Our Website follows all legal requirements to protect your privacy. Gohring. Crystal Structure: Orthorhombic. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. The chemical symbol for Hafnium is Hf. Protactinium was first identified by Kasimir Fajans and O.H. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Pure radium is silvery-white alkaline earth metal. Lead is widely used as a gamma shield. The chemical symbol for Selenium is Se. The chemical symbol for Lead is Pb. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. The chemical symbol for Germanium is Ge. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Protactinium was first identified by Kasimir Fajans and O.H. Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. Electronic configuration. The chemical symbol for Barium is Ba. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. The first two columns on the left side of the periodic table are where the s subshells are being occupied. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. 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. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. Two isotopes of protactinium Pa-231 and Pa-234 occur naturally. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. The chemical symbol for Scandium is Sc. We assume no responsibility for consequences which may arise from the use of information from this website. Neodymium is a soft silvery metal that tarnishes in air. 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. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. They called the element ‘brevium’ because the isotope they had found (protactinium-234) has a very short half-life (1.17 minutes). (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. We are a great educational resource! 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. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Astatine is the rarest naturally occurring element on the Earth’s crust. Characteristics of protactinium The chemical symbol for Tellurium is Te. The chemical symbol for Palladium is Pd. The chemical symbol for Caesium is Cs. This database focuses on the most common chemical compounds used in the home and industry. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. 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. Only about 5×10−8% of all matter in the universe is europium. Francium is an alkali metal, that has one valence electron. The chemical symbol for Copper is Cu. Because of this, the first two rows of the periodic table are labeled the s block. Francium is a highly radioactive metal that decays into astatine, radium, and radon. The bulk properties of astatine are not known with any certainty. The chemical symbol for Antimony is Sb. Multiple-site search is loading. Radon is a radioactive, colorless, odorless, tasteless noble gas. Arsenic is a metalloid. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Compact Fluorescent Lights (CFLs): Are They Worth the Switch? 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. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. The chemical symbol for Lanthanum is La. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. The chemical symbol for Neon is Ne. The chemical symbol for Dysprosium is Dy. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. The esti… These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. The chemical symbol for Cadmium is Cd. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Nevertheless, check the complete configuration and other interesting facts about Protactinium that most people don't know. Introduces stoichiometry and explains the differences between molarity, molality and normality. The Kossel shell structure … All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Oxidation state 0 occurs for all elements – it is simply the element in its elemental form. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Carbon is one of the few elements known since antiquity. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Protactinium. Göhring in 1913 while studying uranium's decay chain. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. The chemical symbol for Fermium is Fm. Schematic electronic configuration of protactinium. It is predicted that 1 will have a 6d{sup 1} electron configuration, which agrees with recent EPR experiments by Edelstein, Lappert, et al. The electron configuration of protactinium is [Rn] 7s25f26d1. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). 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. Protactinium Properties. 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. In the periodic table, the elements are listed in order of increasing atomic number Z. Electron configuration of Protactinium is [Rn] 5f2 6d1 7s2. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. The chemical symbol for Polonium is Po. The chemical symbol for Molybdenum is Mo. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. 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…”. Githy.com. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Einsteinium is the seventh transuranic element, and an actinide. Are there Realistic Dry-Cleaning Alternatives to Perc? It is a soft, silvery-white alkali metal. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. 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 Beryllium is Be. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. 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. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Berkelium is a member of the actinide and transuranium element series. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Its extreme rarity in the Earth’s crust, comparable to that of platinum. The chemical symbol for Americium is Am. 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. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. 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. Iron is a metal in the first transition series. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. The chemical symbol for Rubidium is Rb. When an electron is added to a neutral atom, energy is released. An atom of Protactinium in the gas phase, for example, gives off energy when it gains an electron to form an ion of Protactinium. The mean radius of protactinium is 180 pm. Pure germanium is a semiconductor with an appearance similar to elemental silicon. It is even less abundant than the so-called rare earths. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. All of its isotopes are radioactive. 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. If you continue to use this site we will assume that you are happy with it. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. The chemical symbol for Thorium is Th. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Electron Configuration Number of Neutrons Melting Point Boiling Point Date of Discovery Crystal Structure. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. An atom of an element in a compound will have a positive oxidation state if it has had electrons removed. The chemical symbol for Gold is Au. The chemical symbol for Technetium is Tc. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. The chemical symbol for Titanium is Ti. 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. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. The chemical symbol for Krypton is Kr. Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). Caesium has physical and chemical properties similar to those of rubidium and potassium. It occurs in all uranium ores to the extent of 0.34 part per million of uranium. The Cookies Statement is part of our Privacy Policy. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. 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. It is the fourth most common element in the Earth’s crust. Protactinium is a radioactive element predicted to exist in 1871 by Mendeleev, although it was not discovered until 1917 or isolated until 1934.The element has atomic number 91 and element symbol Pa. Like most elements on the periodic table, protactinium is a silver-colored metal. Neptunium is the first transuranic element. The ground state electron configuration of ground state gaseous neutral protactinium is [ Rn ]. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Its boiling point is the lowest among all the elements. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. Pa-231 is the most abundant naturally occurring isotope. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. The nucleus consists of 91 protons (red) and 140 neutrons (blue). 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 5s 2 5p 6 4f 14 5d 10 6s 2 6p 6 5f 2 6d 1 7s 2. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. 113Cd has specific absorption cross-section. For example, silicon has nine possible integer oxidation states from −4 to +4, but only -4, 0 and +4 are common oxidation states. This fact has key implications for the building up of the periodic table of elements. In the periodic table, the elements are listed in order of increasing atomic number Z. Under standard conditions, it is the lightest metal and the lightest solid element. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. It decays by alpha-emission. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. The chemical symbol for Bismuth is Bi. The chemical symbol for Silicon is Si. Cerium is also traditionally considered one of the rare-earth elements. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. The chemical symbol for Arsenic is As. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. 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. 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. It is a Block F, Group 3, Period 7 element. For example, carbon has nine possible integer oxidation states from −4 to +4. It is a noble metal and a member of the platinum group. 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