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a
2, 8, 13, 1
b
2, 8, 12, 2
c
2, 8, 8, 1
d
2, 8, 8, 2
answer is B.
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Detailed Solution
Cr(Z = 24)...1s22s22p63s23p64s13d5it is also represented as 2, 8, 13, 12, 8, 12, 2 is not possible because the configuration of Cr(Z = 24) is not 1s22s22p63s23p64s23d4