The valency of elements in group 1[IA].
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OneReason — Group number signifies the number of valence electrons of an element. Hence valency of group 1[1A] elements will be one.
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The noble gas having an electronic configuration 2, 8, 8.
The number of electron shells in elements of period 3.
The metals present in period 3 and the non-metals present in period 2.
The group whose elements have zero valency.