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JEE Main levelSingle correct optionDifficulty 2 of 3as202

Among the following ground-state atoms, the one with the largest number of unpaired electrons is

AMn ( $Z = 25$ )
BFe ( $Z = 26$ )
CCo ( $Z = 27$ )
DCr ( $Z = 24$ )

Answer: D

Cr is

3 d^{5} 4 s^{1}

with 6 unpaired electrons. Mn (

3 d^{5} 4 s^{2}

) has 5, Fe (

3 d^{6} 4 s^{2}

) has 4 and Co (

3 d^{7} 4 s^{2}

) has 3.

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