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Question

Which of the following electronic configuration of an atom has the lowest ionisation enthalpy? [CBSE AIPMT 2007]


A

1s2,2s22p5

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B

1s2,2s22p3

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C

1s2,2s22p5,3s1

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D

1s2,2s22p6

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Solution

The correct option is C

1s2,2s22p5,3s1


The electronic configuration 1s2,2s2,2p5,3s1 shows lowest ionisation energy because configuration is unstable due to the presence cf electron in s-orbital. Hence, less energy is required to remove the electron.


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