1) Cations are named first and anions are named later. In this case, there are no anions.
2) The ligands are named in alphabetical order and their prefixes carry no significance. Anionic ligands have a suffix –o attached in the end. So, ammine comes first followed by chlorido
3) This is followed by the name of the central metal and its oxidation state which is platinum(II).
So, the IUPAC name for [Pt(NH3)2Cl2] is Diamminedichloridoplatinum (II).
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