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  4. The first ionization energies (in kJ mol -1 ) of four consecutive elements of the second period are given in the options. The first ionization energy of nitrogen is

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Q. The first ionization energies (in $kJ mol ^{-1}$ ) of four consecutive elements of the second period are given in the options. The first ionization energy of nitrogen is

TS EAMCET 2021

Solution:

The first ionisation energy of nitrogen is $1402 kJ / mol$. Due to the half filled stable configuration of nitrogen it has maximum ionisation potential.
On left to right in periodic table, effective nuclear charge is increasing and ionisation energy also increasing.
$N \rightarrow 2 s^2 2 p^3 $ (stable half-filled orbital)
$O \rightarrow 2 s^2 2 p^4$ (partially finled orbital)
easily lose outer
So. $B, C$ and So, B, $C, N$ and $O$ have ionisation energy 1086 ,
$1314,1402,1681$ respectively.
Hence, nitrogen have $1402 kJ / mol$ energy.