Group 7- Halogens

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5 Terms

1
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Halogens are in group 7 and…

have 7 electrons in their outer shell. When they react, they gain 1 electron.

2
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By gaining 1 electron…

They form a negative ion.

3
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Halogens share electrons…

to make diatomic molecules (molecules made of pairs of atoms)

4
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When a metal atom transfers its outer electron to a non-metal…

salts are formed. The result is a compound where all the ions have a full outer shell.

5
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As you go down the group, halogens become less reactive because…

  • Atoms gain more electron shells.

  • The outer electron shell is further away from the nucleus.

  • The attraction between the nucleus and the electron (gained from another element) decreases.