The ionisation potentials of $Li$ and $K$ are $5.4 \ eV$ and $4.3 \ eV$ respectively. The ionisation potential of $Na$ will be ................ $eV$.
- A$9.7$
- B$1.1$
- C$4.9$
- D$5.1$
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Which among the following elements has the highest first ionization enthalpy?
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