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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2023 · Paper II, Chemistry · Q6 of 120

Geo-Scientist Prelims 2023 Chemistry Q6: The number of unpaired electrons in the ground state of Lu³⁺ ion…

Questionf-block / lanthanide ions

The number of unpaired electrons in the ground state of Lu³⁺ ion (atomic number 71) is :

  1. (a) Zero
  2. (b) One
  3. (c) Two
  4. (d) Three

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