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JEE Main levelSingle correct optionDifficulty 2 of 3as204

The total number of electrons occupying $s$ orbitals in a chromium atom ( $Z = 24$ ) in its ground state is

A7
B8
C6
D5

Answer: A

Cr is

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}

.

s

electrons:

2 + 2 + 2 + 1 = 7

. The value 8 comes from using the

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

configuration.

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