Question

Which of the following electronic configuration of an atom has the lowest ionisation energy?
(A) 1s2,2s2p3
(B) 1s2,2s2p5
(C) 1s2,2s2p5,3s1
(D)1s2,2s2p6

Answer 1

b is right option. . . . .

Answer 2

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Option B is Correct

1s2,2s2p5



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