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Which of the following explains why elements in column 17 (the halogens) are very reactive?

Which of the following explains why elements in column 17 (the halogens) are very reactive?
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Which of the following explains why elements in column 17 (the halogens) are very reactive?

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User Abiku
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They're very reactive because they only need one more valence electron to have a full outer shell.
In other words, they're reactive in order to obtain said valence election.
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User Akm
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