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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper I

Q9(b). Gadolinium moment

Question

Calculate the magnetic moment of gadolinium(III) with its outer electronic configuration being 4f⁷ 6s⁰ taking into account spin-orbit dependence.

Answer in brief

Gd(III) has ⁸S_(7/2) and μ_(eff)=7.94μ_B; L=0 makes the result equal to the spin-only estimate.

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CoversGadolinium momentSpin–orbit coupling

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