a) Copper
b) Chromium
c) Nickel
d) Iron
Answer: b
Explanation: M shell means it is third shell ⇒ n = 3
Number of electrons in M shell = 13
⇒ 3s23p63d5
The electronic configuration is: (1s2) (2s2 2p6) (3s2 3p6 3d5) (4s1)
The element is chromium is Cr.
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