The ionization potentials of $Li$ and $K$ are $5.4 \ eV$ and $4.3 \ eV$ respectively. The ionization potential of $Na$ will be .............. $eV$.

Which one of the following orders is correct for the first ionisation energies of the elements?

The incorrect statement among the following is:

The first ionization enthalpies of $N$ and $O$ are respectively....... $eV$.

As compared to potassium,sodium has

Given below are two statements:
Statement $I$: The decrease in first ionization enthalpy from $B$ to $Al$ is much larger than that from $Al$ to $Ga$.
Statement $II$: The $d$ orbitals in $Ga$ are completely filled.
In the light of the above statements,choose the most appropriate answer from the options given below: