- oxidation number
- a number assigned to each atom in a molecule or ion that represents the number of electrons theoretically gained (positive oxidation numbers) or lost (negative numbers) in converting the atom to the elemental form. Oxidation numbers are assigned according to the following rules. The oxidation number of atoms in an elemental form is zero, and the oxidation number of a monatomic ion equals the ionic charge. Group I and Group II metals always have oxidation numbers of +1 and +2, respectively. Fluorine always has an oxidation number of −1; oxygen always of −2, except in peroxides and superoxides (where it is −1) and in compounds containing OF bonds. Hydrogen always has an oxidation number of +1, except in metal hydrides (where it is −1). Oxidation numbers are assigned to other atoms so that the sum for all atoms in a neutral compound equals zero and the sum for all atoms in a polyatomic ion equals the ionic charge. Called also oxidation state.
Medical dictionary. 2011.
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oxidation number — noun the degree of oxidation of an atom or ion or molecule; for simple atoms or ions the oxidation number is equal to the ionic charge the oxidation number of hydrogen is +1 and of oxygen is 2 • Syn: ↑oxidation state • Hypernyms: ↑number … Useful english dictionary
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oxidation number — (also oxidation state) noun Chemistry a number representing the number of electrons lost or gained by an atom of a particular element when chemically combined … English new terms dictionary
oxidation number — noun see oxidation state … New Collegiate Dictionary
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oxidation number — noun the net sum of the negative, less the positive, charges on an atom … Wiktionary
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