Question: Choose the paramagnetic species from below: A.) Cd 2+ B.) O 2- C.) Nb 3+ D.) Ca My professor posted the answer key and says

Choose the paramagnetic species from below:

A.) Cd2+
B.) O2-
C.) Nb3+
D.) Ca

My professor posted the answer key and says it's C, I don'tunderstand why it's C and not A.

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