# For the second period elements, the correct increasing order of first ionization enthalpy isOption 1)Li < Be < B < C < N < O < F < NeOption 2)Li < B < Be < C < O < N < F < NeOption 3)Li < B < Be < C < N < O < F < NeOption 4)Li < Be < B < C < O < N < F < Ne

2 Option

$Li < B

$Li - 1s^2,2s^1$,    $Be - 1s^2,2s^2$

$B - 1s^2,2s^2, 2p^1$,    $C - 1s^2,2s^2, 2p^2$

$N - 1s^2,2s^2, 2p^3$,    $O - 1s^2,2s^2, 2p^4$

$F - 1s^2,2s^2, 2p^5$,    $Ne - 1s^2,2s^2, 2p^6$

Stability order of the orbitals with electrons

$2p^6 > 2p^5(\textup{due\;to\;F})>2p^3>2p^4>2p^2> 2s^2>2p^1 > 2s^1$

Fully Filled > Half Filled > Partially Filled

Option 1)

Li < Be < B < C < N < O < F < Ne

Option 2)

Li < B < Be < C < O < N < F < Ne

Option 3)

Li < B < Be < C < N < O < F < Ne

Option 4)

Li < Be < B < C < O < N < F < Ne

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