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MHT CET202520 Apr 2025Morning ShiftChemistryd and f Block ElementsActual

What is the number of unpaired electrons in Ti in + 3 state?

Options

  1. A4
  2. B3
  3. C1
  4. D4) Zero

Correct answer

C. 1

Step-by-step solution

Titanium has atomic number 22 with ground state configuration [ Ar ] 3d^2 4s^2 . The Ti ³⁺ ion results from removal of three electrons, taken first from the 4s orbital followed by the 3d orbital, yielding configuration [ Ar ] 3d^1 . In the 3d^1 configuration, the single electron occupies one of the five d orbitals with unpaired spin. Applying Hund's rule confirms this electron remains unpaired. The number of unpaired electrons in Ti ³⁺ is 1 .

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