Cl : halogen group :: Ar : ______
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Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
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Group 7A — The Halogens.
4A Si
5A P
6A S
7A Cl
8A Ar
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