a) 12 and 4
b) 16 and 5
c) 16 and 4
d) 12 and 5
Answer: d
Explanation: Configuration of Cr (Z = 24) is 1s22s22p63s23p63d54s*
1 = 1, denotes p-electrons (2p6, 3p6)
1 = 2, denotes d-electrons (3d5)
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