Helium is a very non reactive gas.
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The British Isles are a group of islands off the northwest coast of continental Europe
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Hydrometer? Reative humidity, measured in per-cent. (Percentage of the concentration of water vapor which saturates the local atmosphere).
He - Helium
The symbol of Helium is He. Helium's atomic number is 2.
helium in a jar diff from helium atom
Unless disturbed by later events, younger layers overlie older layers. See the law of super-position.
The symbol for hydrogen is H, and the symbol for helium is He.
The abbreviation for gas helium is He.