Which of the following electronic configurations will have the highest electron affinity?

[A r] 3 d^{10} 4 s^{2} 4 p^{1}

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[A r] 3 d^{10} 4 s^{2} 4 p^{4}

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[A r] 3 d^{10} 4 s^{2} 4 p^{5}

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[A r] 3 d^{10} 4 s^{2} 4 p^{3}

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Solution

The correct option is C $[A r] 3 d^{10} 4 s^{2} 4 p^{5}$
All the options given are of the same period and we know $Z_{e f f}$ increases from left to right of the periodic table. Again electron affinity increases with increase in effective nuclear charge. Thus the configuration $[A r] 3 d^{10} 4 s^{2} 4 p^{5}$ will have the highest electron gain enthalpy.

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Question 22

Amongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthaply is

(a) $[N e] 3 s^{2} 3 p^{1}$

(b) $[N e] 3 s^{2} 3 p^{3}$

(d) $[A r] 3 d^{10} 4 s^{2} 4 p^{3}$

Which of the following configurations will have the least electron affinity?

Which of the following configuration will have least electron affinity -

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