in the air surround our earth atmosphere, oxygen and nitrogen are the major components.
oxygen is around 21% in Air
Nitrogen is 79% in Air.
why and how Nitrogen presence or percentage is highest?
what is its significance to ecological balance on Earth?
Naturally, there is an ecological balance on Earth if people do not negatively affect this balance too much by burning fossil fuels that generate, among other gases, nitrogen oxides which under the action of radiation produce free radicals and disturb this balance. Nitrogen is predominant because among the basic chemical elements (C, H, O, N, S) nitrogen is the least reactive, it can not be stable in solid form to be incorporated in significant amounts into the soil structures (such as oxygen in the form of silicates or carbon in the form of carbonates). Instead, nitrogen is mobilized and maintained in this natural equilibrium by plants and by surface soil via various bacteria that convert it into ammonium, nitrites and nitrates, then being released back into the atmosphere as free nitrogen.
Well,
Also, its significance to ecological balance on Earth can be shown in the attached Fig.
Sincerely
On earth, nitrogen is inert whereas oxygen is very reactive as it can combine with other atoms or molecules to form compounds of which it support most lives, the food chain or ecological cycles. eg CO2. So these reactions of oxygen on the earth decreases it's abundancy in the atmosphere making nitrogen (78%) higher than oxygen in atmospheric air.