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Q.

Four elements A, B, C and D have electronic configurations given below, which one has highest ionisation energy ?

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a

A=[Ne]3s23p2

b

B=[Ne]3s23p3

c

C=[Ne]3s23p5

d

D=[Ne]3d104s24p3

answer is C.

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Detailed Solution

(1) A=[Ne]3s23p2⇒Silicon (2) B=[Ne]3s23p3⇒ Phosphorus  (3) C=[Ne]3s23p5⇒ Chlorine  (4) D=[Ne]3d104s24p3⇒ Arsenic Chlorine (Cl) possess highest value of ionisation energy among them.
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Four elements A, B, C and D have electronic configurations given below, which one has highest ionisation energy ?