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JEE MainChemistryd and f Block Elements

Which of the following outer electronic configurations corresponds to a transition element that exhibits only a single non-zero oxidation state in its compounds?

Options

  1. A3d^5 4s^1
  2. B3d^1 4s^2
  3. C3d^5 4s^2
  4. D3d^2 4s^2

Correct answer

B. 3d^1 4s^2

Step-by-step solution

The given outer electronic configurations correspond to the following 3d transition elements: 3d^1 4s^2 is Scandium (Sc) 3d^2 4s^2 is Titanium (Ti) 3d^5 4s^1 is Chromium (Cr) 3d^5 4s^2 is Manganese (Mn) Among the 3d transition series elements, Scandium (Sc) exhibits only a +3 oxidation state in its compounds. By losing three electrons, it achieves a highly stable noble gas (Argon) core. The other elements (Ti, Cr, Mn) exhibit multiple variable oxidation states. Answer: 3d^1 4s^2

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