Which gas is most abundant in Earth's atmosphere?

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Multiple Choice

Which gas is most abundant in Earth's atmosphere?

Explanation:
Nitrogen is the most abundant gas in Earth's atmosphere because it is extremely stable and largely inert as N2. This diatomic molecule doesn’t readily react, so it tends to stay in the atmosphere and accumulate to high levels. The atmosphere is roughly 78% nitrogen by volume, with oxygen making up about 21%. The remaining gases—like argon and trace amounts of others—taddle along at well under 1%. Hydrogen is present only in trace amounts because it is light and tends to escape into space over time. So the gas you breathe the most is nitrogen.

Nitrogen is the most abundant gas in Earth's atmosphere because it is extremely stable and largely inert as N2. This diatomic molecule doesn’t readily react, so it tends to stay in the atmosphere and accumulate to high levels. The atmosphere is roughly 78% nitrogen by volume, with oxygen making up about 21%. The remaining gases—like argon and trace amounts of others—taddle along at well under 1%. Hydrogen is present only in trace amounts because it is light and tends to escape into space over time. So the gas you breathe the most is nitrogen.

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