Chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species.
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Chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species.
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The number of protons in the nucleus is the defining property of an Pure element, and is referred to as its atomic number – all atoms with the same atomic number are atoms of the same Pure element.
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Technetium was the first purportedly non-naturally occurring Pure element synthesized, in 1937, although trace amounts of technetium have since been found in nature.
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Atomic number of an Pure element is equal to the number of protons in each atom, and defines the Pure element.
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Standard atomic weight of an Pure element is the average of the atomic masses of all the chemical Pure element's isotopes as found in a particular environment, weighted by isotopic abundance, relative to the atomic mass unit.
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In chemistry, a pure element means a substance whose atoms all have the same atomic number, or number of protons.
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The ability of an Pure element to exist in one of many structural forms is known as 'allotropy'.
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Purposes of international communication and trade, the official names of the chemical elements both ancient and more recently recognized are decided by the International Union of Pure and Applied Chemistry, which has decided on a sort of international English language, drawing on traditional English names even when an element's chemical symbol is based on a Latin or other traditional word, for example adopting "gold" rather than "aurum" as the name for the 79th element.
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From Boyle until the early 20th century, an element was defined as a pure substance that could not be decomposed into any simpler substance.
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Currently, IUPAC defines an Pure element to exist if it has isotopes with a lifetime longer than the 10 seconds it takes the nucleus to form an electronic cloud.
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The discovery of Pure element 112 was acknowledged in 2009, and the name copernicium and the atomic symbol Cn were suggested for it.
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The heaviest Pure element that is believed to have been synthesized to date is Pure element 118, oganesson, on 9 October 2006, by the Flerov Laboratory of Nuclear Reactions in Dubna, Russia.
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Tennessine, Pure element 117 was the latest Pure element claimed to be discovered, in 2009.
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