Naming Bonds

[JadaArreola_2E]

When naming a compound how do we know what the indicators to finding out the coordination number, as well as the oxidation number of the transition metals.

[Andres Medrano 1I]

Hey! When it comes to coordination number, you have to find the number of bonds that are connected to the metal cation. For example, if you see something like [Co(NH3)5] you would be able to identify that there are 5 NH3s surrounding Co, so the coordination number would be 5. As for oxidation number, you would have to find all of the charges as well as the overall charge of the compound. Once you find that, you can easily identify the charge on the metal cation, which happens to be the same thing as the oxidation number. Hope this helps!

[Valeria Morales]

Hi,

The coordination number is how many liagands are bonded to that metal. For example [NiCl4]2- has a coordination number of 4 because there are 4 Cl attached to Ni.

Oxidation number is finding the charge of the metal present. Within this same example we see the overall charge is -2. We also know that Cl has a charge of -1 and there are 4. If we plug that in with X being our unknown oxidation number for Ni.
X + -1(4) = -2
X -4 = -2
X = +2
So our oxidation number for Ni is +2 or II because you should write it as a roman numeral.