A) Scandium
B) Chromium
C) Manganese
D) Iron
Correct Answer: B
Solution :
\[Sc(Z=21):[Ar]\text{ }3{{d}^{1}},\text{ }4{{s}^{2}};\text{ }1\]unpaired electron \[Cr(Z=24):[Ar]\text{ }3{{d}^{5}}4{{s}^{1}};6\]unpaired electrons \[Mn(Z=25):[Ar]\text{ }3{{d}^{5}}4{{s}^{2}};\text{ }5\]unpaired electrons \[Fe(Z=26):[Ar]\text{ }3{{d}^{6}}4{{s}^{2}};\text{ }4\]unpaired electrons Hence, chromium has maximum unpaired electrons.
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