Assertion : The third period contains only 8 electrons and not 18 like 4th period

CHEMISTRY · Subjective · A Level · Chemistry · Atomic structure · Atomic structure

Problem

Assertion : The third period contains only 8 electrons and not 18 like 4th period. Reason : In III period filling starts from

3s^1

and complete at

3p^6

whereas in IV period it starts from

4s^1

and complete after

3d^{10}

and

4s^2