Rules for Determining Oxidation Number

Question 1

Oxidation Number

Answer 1

A number assigned to an atom in a molecular compound or molecular ion that indicates the general distribution of electrons among the bonded atoms.

Question 2

The oxidation number of any uncombined element is

Answer 2

0

Question 3

The oxidation number of a monatomic ion equals

Answer 3

the charge on the ion.

Question 4

The more electronegative element in a binary compound is assigned the number

Answer 4

equal to the charge it would have if it were an ion

Question 5

The oxidation of fluorine is always

Answer 5

-1

Question 6

Oxygen has an oxidation number of -2 unless

Answer 6

it is combined with F, when it is +2, or it is in a peroxide, when it is -1

Question 7

The oxidation state of hydrogen in most of its compounds is +1 unless

Answer 7

it is combined with a metal, in which case it is -1

Question 8

In compounds, the elements of groups 1 and 2 as well as aluminum have an oxidation number

Answer 8

+1, +2, and +3 respectively

Question 9

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

Answer 9

0

Question 10

The sum of the oxidation numbers of all atoms in a polyatomic ion equals

Answer 10

the charge of the ion