The number of electron shells in elements of period 3.
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3Reason — The number of shells present in an atom determines it's period. Hence, element of period 3 will have 3 shells.
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The noble gas having duplet arrangement of electrons.
The noble gas having an electronic configuration 2, 8, 8.
The valency of elements in group 1[IA].
The metals present in period 3 and the non-metals present in period 2.