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Assertion: The third period contains only 8 electrons and not 18 like 4th period. Reason: In III perriod filling starts from 3s^(1) and complete at 3p^(6) whereas in IV period it starts from 4s^(1) annd complete after 3d^(10) and 4s^(2).

Answer»

If both assertion and REASON are TRUE annd the reason is the correct EXPLANATION of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but the reason is FALSE
if assertion is false but the reason is true

Answer :A


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