The composition of the earth atmosphere is:
Nitrogen: 78%.
Oxygen: 21%.
Other gases: 1%.
Reasons for the abundance of nitrogen on earth's crust are:
Nitrogen is very less reactive with elements present on earth's crust. It does not react to make composites and hence present in the molecular form.
Nitrogen is volatile in nature. So it occurs in the gaseous state.
Now, what is a volatile element?
These elements have a low boiling point so they present in gaseous state at normal temperature and pressure.
It is heavier than other gases. Gases like lithium, helium and hydrogen get escaped from earth to space because of low weight. But, nitrogen has higher molecular weight, thus it does not get escaped.
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