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Classification Of Elements And Periodicity In Properties

Question
CBSEENCH11008432
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With which of the following electronic configuration an atom has the lowest ionisation enthalpy? 

  • 1s2 2s22p5

  • 1s2 2s22p3

  • 1s2 2s22p5 3s1

  • 1s2 2s22p6

Solution

C.

1s2 2s22p5 3s1

The electronic configuration 1s2 2s22p5 3s1 shows lowest ionisation energy because this configuration is unstable due to the presence of one electron is s- orbital. Hence, less energy is required to remove the electron.

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