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Q.

The electron affinity values of elements A, B, C and D are -135, - 60, -200 & - 348 kj/mol. The outer electronic configuration of element A is

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a

$3 S^{2} 3 P^{2}$

b

$3 S^{2} 3 P^{4}$

c

$3 S^{2} 3 P^{3}$

d

$3 S^{2} 3 P^{5}$

answer is A.

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Detailed Solution

Si → − 135 P → $-$ 60

S → − 200 Cl → − 348

In periodic table Cl has highest electron gain enthalpy

these are E.A values of some 3rd period elements.

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