Q19 / 200 · Manipal (MET) 2013 · Chemistry

Which has maximum ionisation potential?

A
N
B
$0$
Correct answer
C
$\mathrm{O}^{+}$
D
Na

Solution

$0=1 s^2, 2 s^2 2 p_x^2, 2 p_y^1, 2 p_z^1$ Ionisation potential is dependent on the value of $Z$. $Z$ of $\mathrm{O}^{+}(8) \gt Z$ of $\mathrm{N}(7)$ Thus, ionisation potential of $\mathrm{O}^{+} \gt \mathrm{N}$ Na with one valence electron has least ionisation potential.

Hence, the correct answer is option: 'C'.

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