The glycinate ion, H₂NCH₂CO₂⁻, formed by deprotonation of the amino acid glycine, can function as a bidentate ligand, coordinating to a metal through the nitrogen of the amino group and one of the oxygen atoms.

A copper complex of this ligand has the formula Cu(H₂NCH₂CO₂)₂(H₂O)₂. For this complex, determine the following:
(a) The oxidation state of copper
(b) The coordination number of copper
(c) The number of unpaired electrons
(d) Whether the complex is diamagnetic or paramagnetic

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Glycinate ion, a bidentate ligand H :O: b H-C-C-O: -6- H₂N: Site of bonding to transition metal ion