Question
Which of the following has least ionization potential
✓
Answer
b
(b) $Li$ and ${A_2}{B_3}$ belong to Ist group but $Cs$ has larger size, hence low nuclear attraction force, thus low ionization energy.
(b) $Li$ and ${A_2}{B_3}$ belong to Ist group but $Cs$ has larger size, hence low nuclear attraction force, thus low ionization energy.
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