Periodic System for Chemists

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Halogens

Highly reactive nonmetals in Group 17. Form salts when combined with metals.

Discovery Period: 18th to 20th century (1774-2010)

Characteristics

  • • Highly reactive
  • • Seven electrons in outer shell
  • • Form -1 ions
  • • Exist as diatomic molecules
  • • Strong oxidizing agents
  • • Form salts with metals

Elements (6)

9
F
Fluorine
17
Cl
Chlorine
35
Br
Bromine
53
I
Iodine
85
At
Astatine
117
Ts
Tennessine

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