Assigning Oxidation Numbers

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Chemistry

Chemical Reactions

AP Chemistry

Unit 4: Chemical Reactions

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8 Terms

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Free elements

Elements in their natural state have an oxidation number of 0.

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Diatomic Ions

Ions composed of two atoms have an oxidation number of 0.

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Ions of one atom

Ions consisting of a single atom have an oxidation number equal to their charge.

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Neutral compound

The sum of oxidation numbers in a neutral compound is 0.

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Polyatomic ion

The sum of oxidation numbers in a polyatomic ion equals the charge of the ion.

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Metals

Metals typically exhibit a positive oxidation number.

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Nonmetals

Nonmetals can display positive or negative oxidation numbers depending on the compound they form.

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Hydrogen

Hydrogen commonly has an oxidation number of +1.