Question

how calculate oxidation number

Answer 1

Explanation:

The oxidation number of a free element is always 0.

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

The 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.

Answer 2

Explanation:

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.

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

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

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

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

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