Helium

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Helium is a chemical element, having the chemical symbol He.

Helium
4.002602(2)



  He
2
1s2
[ ? ] Noble gas:
Properties:
Metallic
Uses:
Balloons, Many scientific uses.

Its atomic number (the number of protons) is 2. It has a Standard Atomic Weight of 4.002602(2), and is typically found as a gas in its elemental form.

Helium is considered to be a member of the "Noble gas" class of elements, has a boiling point of -268.93 °C , and a melting point of -272.2 °C .