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Argon

Chemical symbol: Ar

Atomic number: 18

Atomic mass: 39.948

Group: 18 (Noble gases)

Period: 3

Block: p-block

Number of protons: 18

Number of electrons: 18

Number of neutrons (in the most common isotope): 22

Sources:

  • Knowledge Encyclopedia (book)

  • SCIENCIA (book)

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