Question

Why does sodium catch fire if exposed to aire​

Answer 1

Answer:

The tendency of sodium to get rid of that electron, coupled with the ability of the oxygen atom in water (in vapor form in the air) to accept that electron leads to an explosive reaction as NaOH and H2 are formed. This reaction releases a lot of energy in the form of heat.

Answer 2

Answer:

it reacts with air and form sodium oxide and when sodium is highly reactive and vigorously react with air and catch fire