The metals present in period 3 and the non-metals present in period 2.
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Metals present in period 3 are Na, Mg and Al.Non-metals present in period 2 are C, N, O and F.
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The number of electron shells in elements of period 3.
The valency of elements in group 1[IA].
The group whose elements have zero valency.
The non-metal in period 3 having a valency 1.