Explain how to determine an oxidation number

1. The oxidation number of a free element is always 0.

2. The oxidation number of a monatomic ion equals the charge of the ion.

3. The oxidation number of H is + 1, but it is - 1 in when combined with less electronegative elements.

4. The oxidation number of O in compounds is usually - 2, but it is - 1 in peroxides.

The oxidation number of a free element is alwa The oxidation number of a monatomic ion equals the chahe oxidation number of

H

is + 1, but it is - 1 in when combined with less electronegative elements.

The oxidation number of

O

in compounds is usually - 2, but it is - 1 in peroxides.

The oxidation number of a Group 1 element in a compound is + 1.

The oxidation number of a Group 2 element in a compound is + 2.

The oxidation number of a Group 17 element in a binary compound is - 1.

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

The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion