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oxidation state

noun, Chemistry.
the state of an element or ion in a compound with regard to the electrons gained or lost by the element or ion in the reaction that formed the compound, expressed as a positive or negative number indicating the ionic charge of the element or ion.
Also called oxidation number.
Origin of oxidation state
First recorded in 1945-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Contemporary definitions for oxidation number

the degree of oxidaton of an atom or molecule, represented by a positive or negative number; the number of electrons theoretically gained or lost in converting an atom or molecule to its elemental form; also called oxidation state


The oxidation number is number of electrons necessary to restore an atom in a combined state to its elemental form.

noun's 21st Century Lexicon
Copyright © 2003-2014, LLC
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oxidation number in Science
oxidation state  
See valence.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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