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Helium atom

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Helium is composed of Noble gas helium Particles of

Chinese name: Helium atom
Foreign name: Helium

Chemical symbol: He
Atomic number: two
Atomic weight: four point zero zero two six zero two

Helium atom is composed of Noble gas helium The particles of.

Atomic volume : 19.5 (cubic centimeter/mole)

Proton number ：2

Number of extranuclear electrons: 2

Neutron number ：2

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