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AP EAMCET20228 Jul 2022Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Higher second ionisation enthalpies than expected are observed for

Options

  1. ATi, Zn
  2. BMn , Fe
  3. CV , Ni
  4. DCr , Cu

Correct answer

D. Cr , Cu

Step-by-step solution

The electronic configuration of Cr is [ Ar ] 3 d^5 4 s^1 and that of Cu is [ Ar ] 3 d¹⁰ 4 s^1 . Their second ionisation enthalpies are higher than expected because after removal of one electron chromium gets a half-filled electronic configuration and Cu get a fully-filled 3 d electronic configuration. These configuration are more stable than the partial-filled electronic configuration. So, it is very difficult to remove the second electron in both cases. Thus, option (d) is correct.

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