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Halogens are elements found in group 7 of the Periodic Table. They are very reactive as they have seven electrons on the outer shell and are only gaining one more to stabilise. This makes them very reactive and alkali. Fluorine is the most corrosive, found at the top of group seven and astatine, the least corrosive, though is still very corrosive.

The lower down an element in group seven is, the less corrosive it is.

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