Free element

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In chemistry, a free element is a chemical element that is not combined with or chemically bonded to other elements. Examples of elements which can occur as free elements include the oxygen molecule (O2) and carbon.[1] All atoms of free elements have an oxidation number of 0.[2]

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  1. ^ A. Earnshaw and Norman Greenwood. Chemistry of the Elements (Second Edition) ISBN 978-0-7506-3365-9. Mentions "free element" 30 times, for example, "Oxygen is the most abundant element on the earth's surface. It occurs both as a free element and in combination with innumerable compounds." and "Carbon occurs both as a free element and in combined form."
  2. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006–) "Oxidation state".