oxidation numbers

Question 1

An atom of a free element has an oxidation number of….

Answer 1

0

Question 2

A monatomic ion has an oxidation number…

Answer 2

equal to its charge

Question 3

When combined with other elements, alkali metals A1, always..

Answer 3

+1

Question 4

while alkaline earth metals always have an oxidation number of…

Answer 4

+2

Question 5

Fluorine has an oxidation number of..

Answer 5

-1 in all compounds

Question 6

oxygen has an oxidation number of ______ in most compounds

Answer 6

-2

the major exception is in peroxides where oxygen is -1

Question 7

The other halogens (Cl, Br, I) have an oxidation number of ____ in compounds, unless combined with oxygen or fluorine.

Answer 7

-1

Question 8

The sum of the oxidation numbers for all atoms in a neutral compound is equal to….

Answer 8

zero

Question 9

the sum for all atoms in a polyatomic ion is equal to..

Answer 9

the charge of the ion

Question 10

hydrogen has an oxidation number of _____ in most compounds.

Answer 10

+1

The major exception is when hydrogen is combined with metals and the Oxidation number becomes -1