The group whose elements have zero valency.
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Group 18 (Inert gases group)Reason — The group 18 elements have 2 or 8 valence electrons and are stable elements hence have zero valency.
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The valency of elements in group 1[IA].
The metals present in period 3 and the non-metals present in period 2.
The non-metal in period 3 having a valency 1.
The formula of the hydroxide of the element having electronic configuration 2, 8, 2.