Assertion: gas's density | /r/HasProperty | 1 atm
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Source sentences:
text: °C (−345.8 °F) boiling point −195.8 °C (−320.4 °F) density (1 atm, 0° C) 1.2506 grams/litre usual oxidation states −3, +3, +5 electron configuration 1s22s22p3