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AP EAMCET202123 Aug 2021Evening ShiftChemistryd and f Block ElementsActual

Which of the following atoms, in its ground state has the highest number of unpaired electrons?

Options

  1. AChromium [Z=24]
  2. BIron [Z=26]
  3. CManganese [Z=25]
  4. DVanadium [Z=23]

Correct answer

A. Chromium [Z=24]

Step-by-step solution

(a) Chromium ( Z=24 ) Electronic configuration ( EC )=[ Ar ] 3 d^5 4 s^1 Number of unpaired electrons in Cr =6 (b) Iron (Z=26) EC =[ Ar ] 3 d^6 4 s^2 (c) Manganese (Z=25) EC =[ Ar ] 3 d^5 4 s^2 (d) Vanadium (Z=23) , EC =[ Ar ] 3 d^3 4 s^2 Number of unpaired electrons =3 So, chromium ( Cr ) has maximum unpaired electron.

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