TS EAMCET · Chemistry · d and f Block Elements
The number of unpaired electrons in \(\mathrm{Co}^{2+}\), is
- A 2
- B 3
- C 4
- D 5
Answer & Solution
Correct Answer
(B) 3
Step-by-step Solution
Detailed explanation
Atomic number of \(\mathrm{Co}=27\) Electronic configuration of Co is [Ar] \(3 d^7 4 s^2\). Electronic configuration of \(\mathrm{Co}^{2+}\) is \([\mathrm{Ar}] 3 d^7 4 s^0\). So, number of unpaired electrons is 3.
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