(2016 Main)
Na
K
Sc
Rb
Correct Answer: 24. (c)
Order of first ionisation energy is $\mathrm{Rb}<\mathrm{K}<\mathrm{Na}<\mathrm{Sc}$
Due to poor shielding effect, removal of one electron from $3 s$ orbital is difficult as compared to $4 s$-orbital.
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