A) $ Z{{n}^{++}} $
B) $ C{{u}^{++}} $
C) $ C{{d}^{++}} $
D) $ H{{g}^{++}} $
Correct Answer: A
$ Zn-3d^{10}4s^{2} $
$ Z{{n}^{++}}-3d^{10}4s^{0} $
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