First slide

Periodicity in atomic properties

Question

Which of following will have the most negative electron gain enthalpy and which the least negative? F, P, S, Cl

Moderate

A

P, Cl
B

Cl, F
C

Cl, S
D

Cl, P

Solution

$Cl \to [Ne] 3 s^{2} 3 p^{5}$
$P \to [Ne] 3 s^{2} 3 p^{3} ⟶ stable half-filled configuration$
$Most negative electron gain enthalpy \to Cl$
$Least negative electron gain enthalpy \to P$

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