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Question

The lowest first ionization energy would be associated with which of the following electronic configurations


A

1s2 2s2 2p6 3s1

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B

1s2 2s2 2p5

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C

1s2 2s2 2p6

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D

1s2 2s2 2p6 3s2 3p2

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Solution

The correct option is A

1s2 2s2 2p6 3s1


Among elements of same period (a & d) ; alkali

metal (a) have least ionization energy due to larger atomic size. b and c belong to II period element. II period

elements have more I.e than III period elements.

Order of I.E. a<d<b<c


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