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Structure of Atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
MCQ
Which of the following options does not represent ground state electronic configuration of an atom?
  • A
    1s2 2s2 2p6 3s2 3p6 3d8 4s2
  • B
    1s2 2p6 3s2 3p6 3d9 4s2
  • C
    1s2 2s2 2p6 3s2 3p6 3d10 4s1
  • D
    1s2 2s2 2p6 3s2 3p6 3d5 4s1
✓

Answer

  1. 1s2 2p6 3s2 3p6 3d9 4s2

Explanation:

Correct configuration should be 1s2 2s2 2p6 3s2 3p6 3d10 4s1 for the copper which has atomic number 29(29Cu). Due to extra stability of full filled orbital of d-subshell, the last electron enter into d-orbital instead of s-orbital.

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