Helium
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Helium is a chemical element with symbol He and atomic number He in period 1. It appears as a colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field. It is a Gas
Chemical properties
[edit]Helium has an atomic mass of 4.0026022, a boiling point of 4.222, a density of 0.1786, a melting point of 0.95, a molar heat of None, an electron configuration of 1s2, and an electron affinity of -48.