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HalogensA halogen is one of the highly reactive elements located in group 17 of the Periodic Table. The halogens (in increasing Atomic Mass) are: fluorine, chlorine, bromine, iodine, and astatine.

Each of these nonmetallic elements is related by the fact that each one has an outermost electron shell (valence shell) that is one electron short of being full. That drives these elements to react with any other atoms from which they can borrow that single electron, including themselves. The halogens are all diatomic, meaning they naturally pair up to form two-atom molecules such as F2, Cl2, Br2, etc. (Note: astatine is very rare and should theoretically be diatomic, but it's inconclusive).

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โˆ™ 2017-02-15 08:11:38
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Q: What is a halogen?
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