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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
Which is incorrect configuration for s-block elements?
  • A
    [Ar]3d104s2
  • B
    [Ar]3d104s1
  • C
    Both A and B
  • D
    None of these
✓

Answer

  1. Both A and B

Explanation:

[Ar]3d104s2 - Last filling electron is in 3d.
[Ar]3d104s1 - Last filling electron is in 3d.
Thus, both are d-block element.
[Ar]4s1−2 is a configuration of s-block.

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