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MHT CET202616 April 2026Evening ShiftChemistryd and f Block ElementsActual

Which of the following series of transition elements has general electronic configuration, [ Kr ] ,4d¹⁻¹⁰ ,5s⁰⁻² ?

Options

  1. A3d series elements
  2. B4d series elements
  3. C5d series elements
  4. D6d series elements

Correct answer

B. 4d series elements

Step-by-step solution

The general electronic configuration [ Kr ] ,4d¹⁻¹⁰ ,5s⁰⁻² corresponds to the transition elements of the 5th period. In these elements, the 4d subshell is progressively filled from Yttrium (Y) to Cadmium (Cd). Since the 4d orbitals are being filled, this series is known as the 4d series of transition elements. Answer: 4d series elements

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