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JEE Main levelOne or more correct optionsDifficulty 2 of 3as209

Which of the following ground-state electronic configurations are correct?

ACr: $[Ar] 3 d^{5} 4 s^{1}$
BCu: $[Ar] 3 d^{9} 4 s^{2}$
CPd: $[Kr] 4 d^{10}$
DMo: $[Kr] 4 d^{5} 5 s^{1}$

Answer: A, C, D

Cr, Mo (half-filled

d

plus singly filled

s

) and Pd (

4 d^{10} 5 s^{0}

, a special case) have these configurations. Cu is

3 d^{10} 4 s^{1}

, not

3 d^{9} 4 s^{2}

, so B is wrong.

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