Periodic Table of the Elements: Helium

Related article: Periodic Table of the Elements (table)Periodic Table of the Elements
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Periodic Table of the Elements: Helium
Atomic Number:2
Atomic Symbol:He
 Heliumhelium
, gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272°C; at 26 atmospheres pressure; b.p. −268.934°C; at 1 atmosphere pressure; density 0.1785 grams per liter at STP; valence usually 0.
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Atomic Weight:4.0026
Electron Configuration:2
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