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| Oxygen Oxygen, the colorless, odorless, tasteless elemental gas that supports life and combustion. |
Nitrogen At room temperature and atmospheric pressure, nitrogen is a colorless, odorless, nontoxic, nonflammable gas. | |
| Argon A colorless, odorless, nonreactive, inert gas. |
Helium A colorless, odorless, nonreactive inert gas which is compressed to high pressures. | |
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