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Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. The chemical symbol for Polonium is Po. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. The color of amorphous selenium is either red (in powder form) or black (in vitreous form). The chemical symbol for Bromine is Br. 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. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Lead is widely used as a gamma shield. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. 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. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. It has the symbol Se. The chemical symbol for Rhenium is Re. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. The chemical symbol for Mercury is Hg. 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. Selenium ek chemical element hae jiske chemical symbol Se, atomic number 34 aur mass number 78.96 hae. 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 Selenium is Se . Sodium is a soft, silvery-white, highly reactive metal. Holmium is a part of the lanthanide series, holmium is a rare-earth element. 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. Astatine is the rarest naturally occurring element on the Earth’s crust. The chemical symbol for Curium is Cm. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. A solid non-metal, selenium is in group 16, period 4, and the p-block of the periodic table. Neptunium metal is silvery and tarnishes when exposed to air. (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. The chemical symbol for Germanium is Ge. of atomic selenium involves the composition of selenium vapour. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. The chemical symbol for Mercury is Hg. Radon is a radioactive, colorless, odorless, tasteless noble gas. The chemical symbol for Aluminum is Al. The chemical symbol for Thorium is Th. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. It is one of the least reactive chemical elements and is solid under standard conditions. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). 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 chemical symbol for Francium is Fr. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Europium is one of the least abundant elements in the universe. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. The chemical symbol for Thorium is Th. The chemical symbol for Neon is Ne. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Elemental sulfur is a bright yellow crystalline solid at room temperature. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. The chemical symbol for Francium is Fr. © 2019 periodic-table.org / see also Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Thulium is an easily workable metal with a bright silvery-gray luster. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. The name samarium is after the mineral samarskite from which it was isolated. All of its isotopes are radioactive. It occurs on Earth as the decay product of various heavier elements. The chemical symbol for Lanthanum is La. In the periodic table, the elements are listed in order of increasing atomic number Z. 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. 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. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. The bulk properties of astatine are not known with any certainty. The chemical symbol for Einsteinium is Es. Major advantage of lead shield is in its compactness due to its higher density. The chemical symbol for Nobelium is No. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Ce troisième élément du groupe VI A (groupe des chalcogènes) est un non-métal. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. Holmium is a relatively soft and malleable silvery-white metal. The chemical symbol for Neon is Ne. 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 Rubidium is Rb. Because of its high chemical reactivity, barium is never found in nature as a free element. The chemical symbol for Erbium is Er. This fact has key implications for the building up of the periodic table of elements. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. The chemical symbol for Osmium is Os. Rights Managed. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 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. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Request PRICE Add To Basket Remove. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. : How to explain the framework to the interviewer. The bulk properties of astatine are not known with any certainty. CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY CARLOS … Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. 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. Pure germanium is a semiconductor with an appearance similar to elemental silicon. The chemical symbol for Fermium is Fm. Einsteinium is the seventh transuranic element, and an actinide. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. Edit edit. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. The chemical symbol for Bismuth is Bi. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. The chemical symbol for Berkelium is Bk. 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. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. The chemical symbol for Iridium is Ir. The chemical symbol for Lawrencium is Lr. The chemical symbol for Ruthenium is Ru. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Lead is soft and malleable, and has a relatively low melting point. 34 electrons (white) successively occupy available electron shells (rings). The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. See also: Atomic Number – Does it conserve in a nuclear reaction? Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. The chemical symbol for Dysprosium is Dy. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. Francium is an alkali metal, that has one valence electron. Zirconium is widely used as a cladding for nuclear reactor fuels. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. 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. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. The chemical symbol for Iridium is Ir. The nucleus consists of 34 protons (red) and 45 neutrons (orange). Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). The chemical symbol for Rhodium is Rh. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atom’s electrons has been assigned a unique set of quantum numbers. Neptunium metal is silvery and tarnishes when exposed to air. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. Berkelium is a member of the actinide and transuranium element series. Its boiling point is the lowest among all the elements. The chemical symbol for Tellurium is Te. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. The chemical symbol for Bromine is Br. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. The chemical symbol for Technetium is Tc. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. The chemical symbol for Californium is Cf. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 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. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. It is used in photoelectric cells, TV cameras, xerography machines and as a semiconductor in solar batteries and rectifiers. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. The chemical symbol for Helium is He. ADD TO BOARD Share. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. The chemical symbol for Silver is Ag. 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. Fermium is a member of the actinide series. al. Selenium content in selenium polysaccharide can be determined by fluorescence spectrophotometry,isoelectroniccoupled ionization and atomic absorption spectrometry.The sugar content of selenium polysaccharide can be determined by phenol-sulfuric acid method and anthrone-sulfuric acid method.Selenium polysaccharide has a typical characteristic absorption peak, which can … Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. Cerium is also traditionally considered one of the rare-earth elements. A possible crystal structure of Selenium is hexagonal structure. The chemical symbol for Fermium is Fm. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. The chemical symbol for Neptunium is Np. It is the fourth most common element in the Earth’s crust. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. The chemical symbol for Thallium is Tl. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Our Website follows all legal requirements to protect your privacy. Tellurium is far more common in the universe as a whole than on Earth. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Carbon is one of the few elements known since antiquity. Neodymium is a soft silvery metal that tarnishes in air. 1600 x 905 jpeg 160kB Its properties are thus intermediate between those of chlorine and iodine. 11 (a) Top and (b) side view of the structure of hexagonal Se (from Ref. 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 Plutonium is Pu. Le sélénium est un oligo-élément antioxydant qui intervient dans le métabolisme des radicaux libres et d'autres substances produites par l'oxydation … The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. 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. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Gold is a transition metal and a group 11 element. Tin is a post-transition metal in group 14 of the periodic table. 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. 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 Radon is Rn. The chemical symbol for Radium is Ra. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. The chemical symbol for Curium is Cm. The chemical symbol for Germanium is Ge. Selenium (Se). Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. : How to explain the framework to the interviewer. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. The chemical symbol for Scandium is Sc. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). 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. The chemical symbol for Astatine is At. Krypton is a member of group 18 (noble gases) elements. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Thulium is an easily workable metal with a bright silvery-gray luster. Atomic Mass of Selenium Atomic mass of Selenium is 78.96 u. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. Learn Selenium-WebDriver with Core Java. 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. The chemical symbol for Helium is He. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. 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. Atomic Number – Does it conserve in a nuclear reaction? Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. The chemical symbol for Krypton is Kr. The chemical symbol for Neptunium is Np. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 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. A freshly exposed surface of pure copper has a reddish-orange color. The chemical symbol for Neodymium is Nd. Neptunium is the first transuranic element. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. The chemical symbol for Praseodymium is Pr. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. The chemical symbol for Manganese is Mn. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. 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. We assume no responsibility for consequences which may arise from the use of information from this website. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). The chemical symbol for Sodium is Na. 34 which means there are 19 protons and 90 electrons in the Earth ’ s in! Is either red ( in powder form ) pure copper has a melting point and is least..., grey-white, strong transition metal that is malleable, and high strength in... Boron group gray cast, has the atomic structure or as pure compounds. 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