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  4. Which of the following atoms has the highest first ionization energy?

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Q. Which of the following atoms has the highest first ionization energy?

NTA AbhyasNTA Abhyas 2022

Solution:

Ionisation energy decreases with increase in the size of atom. $Na,K,Rb$ belongs to alkali metal and down the group ionization energy decreases as size of atom increases down the group. Among the given elements, $Sc$ being small has the highest ionization energy $\left(\right.Na=496,K=419;Sc=631kJ\left(mol\right)^{- 1}\left.\right)$