Which gas accounts for about 78 percent of Earth's atmosphere?

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Multiple Choice

Which gas accounts for about 78 percent of Earth's atmosphere?

Explanation:
Earth's atmosphere is dominated by a single gas. About 78 percent of the air by volume is nitrogen, with oxygen making up roughly 21 percent and the remainder being a mix of trace gases such as argon, neon, carbon dioxide, and others. Nitrogen exists mainly as N2, a diatomic molecule held together by a very strong triple bond, which makes it very stable and not readily reactive under ordinary conditions. That stability means nitrogen remains the primary component over geological timescales, so it is why it accounts for such a large majority of the atmosphere. The other gases are present in much smaller amounts, so they don’t come close to matching nitrogen’s share.

Earth's atmosphere is dominated by a single gas. About 78 percent of the air by volume is nitrogen, with oxygen making up roughly 21 percent and the remainder being a mix of trace gases such as argon, neon, carbon dioxide, and others. Nitrogen exists mainly as N2, a diatomic molecule held together by a very strong triple bond, which makes it very stable and not readily reactive under ordinary conditions. That stability means nitrogen remains the primary component over geological timescales, so it is why it accounts for such a large majority of the atmosphere. The other gases are present in much smaller amounts, so they don’t come close to matching nitrogen’s share.

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