Answer to Question #177325 in Inorganic Chemistry for Teala

Question #177325

Assign charges to each of the ligands and to the central cation: OsO4


1
Expert's answer
2021-04-02T05:10:52-0400

Os is a transition metal in period 6. It has 8 valence electrons (6s2, 5d6) and forms double bonds with each oxygen resulting in a 16 electron complex.

Conventionally, the metal will have an oxidation number of +8

because;

x + 4(-2) = 0

x + (-8) = 0

x= +8

Thus the charge on Osmium should be 8+ and for each oxygen is 2-.


However, Os does not possess an 8+ charge because the Ionization Energy required to produce this charge (8+) far much exceeds the energies available in normal chemical reactions, and that is why the bonding is largely covalent.


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