Simple Description

Elements from group 7 of the Periodic Table, such as chlorine and bromine

Further Detail

Halogens always have 7 electrons in their outer shell. Their reactivity increases as you move up the group (i.e. fluorine is the most reactive) - this is because the outer shell is closer to the nucleus with fluorine and chlorine and therefore accepts an electron much more readily then a lower atom will.

Related Words:

• Outer shell
• Covalent

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