Choose the correct order of second ionisation enthalpies of Carbon,Nitrogen,Oxygen and Fluorine.

Would you expect the first ionization enthalpies for two isotopes of the same element to be the same or different? Justify your answer.

The first ionisation energy of $Na$,$B$,$N$ and $O$ atoms follows the order

Identify the incorrect match regarding Ionization Potential $(I.P.)$ trends:

$I.P.$ \text{ Trend}	Reason
$A$. $N > O$	Half-filled configuration
$B$. $Zr < Hf$	Lanthanide contraction
$C$. $Na > K$	$Z_{eff}$
$D$. $Al < Ga$	Transition contraction

The ionization energy of an element is defined as:

The first ionisation potential $(IP)$ of the elements $Na$,$Mg$,$Si$,$P$,$Cl$ and $Ar$ are $5.14$,$7.65$,$8.15$,$10.49$,$12.97$ and $15.76 \ eV$,respectively. The $IP$ (in $eV$) of $K$ is closest to