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All group 18 elements (the noble gases) exist as monatormic gases at room temperature and standard pressure. All other elements form diatomic gases, if they exist as gas under the specified conditions.

Among the listed elements there is only one noble gas:

Argon

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13y ago
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11y ago

The majority of chemical elements are solid or liquid at room temperature; for example gases are only hydrogen, nitrogen, oxygen, fluorine, chlorine, noble gases.

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10y ago

Nitrogen

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Q: Which element does NOT exist as a diatomic gas at room temperature and atmospheric pressure?
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Which group 15 element exists as a diatomic molecule at room temperature and pressure?

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