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Gases: starting with H

Name a gas that starts with H. Hopdown accepts 23 answers here. Common answers keep your bunny near the surface; rare ones dig deeper. Any substance that is a gas at room temperature and normal pressure. Canonical name starts with H.

Part of Gases.

Answers

• HeliumExtremely common
• HydrogenCommon
• Hydrogen SulfideUncommon
• Hydrogen FluorideUncommon
• HydrofluorocarbonUncommon
• Hydrogen ChlorideRare
• Helium-3Rare
• HalonRare
• Helium-4Rare
• Hydrogen IodideRare
• Hydrogen BromideRare
• Hydrogen SelenideRare
• HexafluoroethaneRare
• HydrochlorofluorocarbonVery rare
• HCFCVery rare
• Halon 1301Very rare
• Hydrogen DeuterideVery rare
• H2Very rare
• H2SVery rare
• HeVery rare
• HClDeep cut
• HFDeep cut
• Halon 1211Deep cut