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The outer shell, known as the valence; it is a good indicator of an elements reactivity. If you look at the Periodic Table, elements in group I and VII are highly reactive because they form ionic bonds very easily due to the fact that they have one and seven eletrons in their outer shell respectively, making each very close to the octet which is where elements seem to be stable. Those in group I easily lose their one eletron and those in group VII easily gain one. It also occurs with the other groups to a lesser degree.

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