Q. The actual configuration of $C r$ is:

1303 245 The d-and f-Block Elements Report Error

A

$[A r] 3 d^{5} 4 s^{1}$

63%

B

$[A r] 3 d^{4} 4 s^{2}$

26%

C

$[Kr] 3 d^{5} 4 s^{1}$

8%

D

$[Kr] 3 d^{4} 4 s^{2}$

3%

Solution:

$C r = 24 = [A r] 3 d^{5} 4 s^{1}$