Answer:
A. Ar+2
B. 18
C. 0
Step-by-step explanation:
There are total of 2 + 2 + 6 + 2 + 4 = 16 electrons
since the cation is +2, it's neutral state should be 16 + 2 = 18
A. The ion is Ar+2
C. Since 3p => 4s => 3d, there is no 3d
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