In each of thefollowingquestionsa Statementof Assertion(A ) isgivenfollowedby acorrespondingstatementof Reason(R ) Justbelow it . Of thestatementmarkthe correctanswer as Assertion. Firstionizationenergy fornitrogen islowerthan thatof oxygen . Reason . Acrossa periodeffectivenuclearchargedecreases.

In each of thefollowingquestionsa Statementof Assertion(A ) isgivenfol

1.	In each of thefollowingquestionsa Statementof Assertion(A ) isgivenfollowedby acorrespondingstatementof Reason(R ) Justbelow it . Of thestatementmarkthe correctanswer as Assertion. Firstionizationenergy fornitrogen islowerthan thatof oxygen . Reason . Acrossa periodeffectivenuclearchargedecreases.
Answer» SOLUTION :CORRECTASSERTION . Firstionizationenergyofnitrogenis HIGHERTHAN THATOF OXYGEN. Correctreason.Nitrogen hasstableexactlyhalf - filledelectronicconfigurationbut oxygendoes nothave.