The correct order of C, N, O and F in terms of second ionisation potential is [2026]

Question

The correct order of C, N, O and F in terms of second ionisation potential is [2026]

Smart Achievers · Accepted Answer

(2)

To compare second ionization potential, configuration of mono-cation is observed

C^{+}

N^{+}

O^{+}

F^{+}

[He] 2 s^{2} 2 p^{1}

[He] 2 s^{2} 2 p^{2}

$[He] 2 s^{2} 2 p^{3}$

Half-filled stable

[He] 2 s^{2} 2 p^{4}

$2nd IE order: O > F > N > C$

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