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Periodic Table

Tap any element to see how it bonds, where you meet it in the games, and the concept pages that explain it. Need paper? Free printable PDFs.

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Alkali metal6
Alkaline earth metal6
Transition metal38
Post-transition metal11
Metalloid7
Nonmetal7
Halogen6
Noble gas7
Lanthanide15
Actinide15

Family

Halogen

Group 17. One electron short of a noble-gas configuration: among the most reactive nonmetals on the table.

Worth knowing

  • Gain one electron to form −1 ; combine with metals to make salts (“halogen” = “salt-former”).
  • Reactivity decreases down the group: F > Cl > Br > I.
  • Fluorine is the most element on the table.

Examples

FClBrIAt

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