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MHT CET202519 Apr 2025Morning ShiftChemistryd and f Block ElementsActual

Which from following elements is NOT regarded as transition element?

Options

  1. ANi
  2. BFe
  3. CAg
  4. DHg

Correct answer

D. Hg

Step-by-step solution

Transition elements are defined as those having an incompletely filled d-subshell in their ground state or common oxidation states. Nickel (Ni, Z=28) has ground state configuration [ Ar ] 3d^8 4s^2 , and Ni ²⁺ configuration [ Ar ] 3d^8 , showing incomplete d-subshell. Iron (Fe, Z=26) has ground state [ Ar ] 3d^6 4s^2 , with Fe ²⁺ at [ Ar ] 3d^6 and Fe ³⁺ at [ Ar ] 3d^5 , both incomplete. Silver (Ag, Z=47) has ground state [ Kr ] 4d¹⁰ 5s^1 . While Ag ^+ is [ Kr ] 4d¹⁰ (complete), Ag ²⁺ is [ Kr ] 4d^9 , exhibiting an

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