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Predict the number of d-electrons AND number of unpaired electrons on the metal in each of...

Predict the number of d-electrons AND number of unpaired electrons on the metal in each of the following complexes (explanations helpful!):

1. [Cr(H2O)4F2]

2. [Rh(en)3]3+

3. [Pt(CN)4]2-

4. [TiCL4]3-

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