Write the coordination number and oxidation state of Pt in the complex [Pt(en)₂Cl₂.

The coordination number of Platinum in the complex [Pt(en)₂​Cl₂​] is 6. Platinum atom is surrounded by six donor atoms. Chlorine is monodentate ligand with one donor atom. Ethylene diamine (en, H₂​N−CH₂​−CH₂​−NH₂​) is bidentate ligand with 2 donor N atoms.

Let x be the oxidation state of Platinum in the complex [Pt(en)₂​Cl₂​]. The oxidation states of Cl and en are 0 and −1 respectively.
x+2(0) +2(−1) =0
x−2=0
x=+2
The oxidation state of Platinum in the complex [Pt(en)₂​Cl₂​] is +2.