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Chlorine

Chemical symbol: Cl

Atomic number: 17

Atomic mass: 35.453

Group: 17 (Halogens)

Period: 3

Block: p-block

Number of protons: 17

Number of electrons: 17

Number of neutrons (in the most common isotope): 18

Sources:

  • Knowledge Encyclopedia (book)

  • SCIENCIA (book)

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