Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which elements/ions have same number of unpaired electrons? (1) \[F{{e}^{3+}}\] (2) \[Cr\] (3) \[C{{u}^{+}}\] (4) \[V\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
\[F{{e}^{3+}}(Z=26):[Ar]\,3ds,4{{s}^{0}}:\]5 unpaired electrons \[Cr(Z=24):[Ar]\text{ }3{{d}^{5}}4{{s}^{1}}:\]5 unpaired electrons
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