Atom model

Description: 

Helium is a colorless gas, it is in group 0 in the periodic table, which means it has a full electron charge in the outer electron orbital.

Helium

Atomic Number: 2

Atomic mass: 4.002602

Melting point: -272 °C

Boiling point: -268.6 °C

Electronegativity: unknown

discoverer: Sir Ramsey

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