Oxidation number

Front

What is the oxidation number of an element in its elemental form?

Back

0

Front

What is the oxidation number of hydrogen in most compounds?

Back

+1

Front

What is the oxidation number of oxygen in most compounds?

Back

-2

Front

What is the oxidation number of alkali metals in compounds?

Back

+1

Front

What is the oxidation number of alkaline earth metals in compounds?

Back

+2

Front

What is the oxidation number of halogens in compounds?

Back

-1, unless combined with oxygen or other halogens above them in the group.

Front

How do you determine the oxidation number of an atom in a polyatomic ion?

Back

The sum of the oxidation numbers of all atoms in the ion equals the charge of the ion.

Front

What is the oxidation number of carbon in CO₂?

Back

+4

Front

What is the oxidation number of sulfur in H₂SO₄?

Back

+6

Front

What is the oxidation number of nitrogen in NH₃?

Back

-3