The elements in Group 7 are known as the 'Halogens'.
Halogens are non-metals - some are liquid, some are gas.
They bond covalently in pairs.
The halogens have 7 electrons in their outer shell.
This means they need to gain 1 electron to become stable.
This means they react with metals, particularly Group 1 metals (as they give away 1 electron).
Group 7 halogens react with metals to form ionic bonds. This is where they transfer electrons.
They also bond with non-metals to form covalent bonds. In these bonds, electrons are shared.
The melting and boiling point increase going down the group.
The reactivity decreases going down the group.
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