Which of the following has least ionization potential - Vidyadip

MCQ

Which of the following has least ionization potential

A
$Li$
✓
$Cs$
C
$Cl$
D
$I$

✓

Answer

Correct option: B.

$Cs$

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.

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