News: selenium ion symbol

The chemical symbol for Thulium is Tm.

The chemical symbol for Xenon is Xe. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. 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. Six isotopes existent à l'état naturel, de nombres de masse 74, 76, 77, 78, 80 et 82. 3  Lead is a heavy metal that is denser than most common materials. Bernard GAUDREAU, Thulium is an easily workable metal with a bright silvery-gray luster. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. The name samarium is after the mineral samarskite from which it was isolated. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Pure radium is silvery-white alkaline earth metal. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Also to help understand this concept there is a chart of the nuclides, known as a Segre chart. Les rayons atomique et covalent sont respectivement de 0,140 nm et 0,117 nm.

It occurs on Earth as the decay product of various heavier elements.

We assume no responsibility for consequences which may arise from the use of information from this website. 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). Actinium is a soft, silvery-white radioactive metal. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. The chemical symbol for Boron is B. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. 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 chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. In nuclear reactors, promethium equilibrium exists in power operation. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. Because of its high chemical reactivity, barium is never found in nature as a free element. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. FAQ; Credits; More documentation; selenium anion. Einsteinium is the seventh transuranic element, and an actinide. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 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. Uranium is a silvery-white metal in the actinide series of the periodic table. Sodium is a soft, silvery-white, highly reactive metal. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. The chemical symbol for Indium is In.

The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. The chemical symbol for Terbium is Tb. If you continue to use this site we will assume that you are happy with it.

Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. Uranium is a silvery-white metal in the actinide series of the periodic table.

The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. ENZYMES - Cofacteurs de l'activité enzymatique, https://www.universalis.fr/encyclopedie/selenium/, dictionnaire de l'Encyclopædia Universalis. Neodymium is a soft silvery metal that tarnishes in air. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Thulium is the thirteenth and third-last element in the lanthanide series. Francium is an alkali metal, that has one valence electron. Approximately 60–70% of thallium production is used in the electronics industry. Chlorine is a yellow-green gas at room temperature. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Inscrivez-vous à notre newsletter hebdomadaire et recevez en cadeau un ebook au choix ! The chemical symbol for Ruthenium is Ru. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Uranium has the highest atomic weight of the primordially occurring elements. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure.

URL : https://www.universalis.fr/encyclopedie/selenium/, Encyclopædia Universalis - Contact - Mentions légales - Consentement RGPD, Consulter le dictionnaire de l'Encyclopædia Universalis. Elemental sulfur is a bright yellow crystalline solid at room temperature. © 2020 Encyclopædia Universalis France.Tous droits de propriété industrielle et intellectuelle réservés. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. 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. 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. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights.

The chemical symbol for Tellurium is Te. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Its boiling point is the lowest among all the elements. «  SÉLÉNIUM  » est également traité dans : Dans le chapitre « Pigments de cadmium » and Gay-Lussac, L.-J.

and Gay-Lussac, L.-J. Lire la suite, Symbole chimique : Te Numéro atomique : 52 Masse atomique : 127,6 g Point de fusion : 449,8 0 C Point d'ébullition : 1 390 0 C Densité (à 20 0 C) : 6,4 Élément chimique de la famille des chalcogènes (colonne VI  a de la classification périodique), d'aspect argenté et de dureté 2,3 (échelle Mohs), le tellure fut découvert en 1798 par M. H. Klaproth et étudié par J. J. Berzelius (1832). Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Krypton is a member of group 18 (noble gases) elements. The chemical symbol for Americium is Am. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust.

The chemical symbol for Boron is B. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Discoverer: Lecoq de Boisbaudran, Paul-Émile. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 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. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon.  : […] A freshly exposed surface of pure copper has a reddish-orange color. 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. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. Lead is widely used as a gamma shield. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. As a result, as the number of protons increases, an increasing ratio of neutrons to protons is needed to form a stable nucleus. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. The chemical symbol for Selenium is Se. The chemical symbol for Chromium is Cr. It is fairly soft and slowly tarnishes in air.

These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. The chemical symbol for Einsteinium is Es. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. The chemical symbol for Calcium is Ca. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. Aussi le sélénium n'est qu'un sous-produit de l'affinage électrolytique du cuivre. Mass was no longer considered unchangeable in the closed system. The chemical symbol for Aluminum is Al. The Van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. All of its isotopes are radioactive. The chemical symbol for Ytterbium is Yb. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226.

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