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# The first ionization potentials in electrons volts of nitrogen and oxygen atoms are respectively given by

$(a)\;14.6,13.6 \\(b)\; 13.6,14.6 \\ (c)\;13.6 ,13.6 \\ (d)\;14.6,14.6$

$7^N(1s)^2(2s)^2(2px)^1(2py)1(2pz)^1$
$8^0(1s)^2(2s)^2(2px)^2(2py)1(2pz)^1$
Hence a is the correct answer.