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22 3 Electron counting for transition metal complexes

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Physical Chemistry (PChem) 161 tutorials here
Chemistry

Electron counting for cisplatin, hexaaquairon(II), hexacyanidoferrate(II), ferrocene, Bis(η5-cyclopentadienyl)titanium(IV) pentasulfide, Ti(C5H5)2S5. 16 valence electrons surround the transition metal center in cisplain and Ti(C5H5)2S5; 18 in other complexes.