First slide

Periodicity in atomic properties

Question

Which of the following transitions involves maximum amount of energy

Moderate

A

$M^{-} (g) \to M (g)$
B

$M (g) \to M^{+} (g)$
C

$M^{+} (g) \to M^{2 +} (g)$
D

$M^{2 +} (g) \to M^{3 +} (g)$

Solution

$M^{2 +} \to M^{3 -}$ After the removal of $2 e^{-}$ the nuclear charge per $e^{-}$ increases, due to which high energy is required to remove 3^rde^-.

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