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It's simply the number of bonds. Unless you're dealing with a polydentate ion, then I believe you may have to take that into account. For example, if you have a bidentate ligand bonded to a metal I believe the coordination number would be two and not one. I hope this helps:)
VanessaZhu1K wrote:Yes, thank you! Also, does anyone know how to calculate oxidation number?
To find oxidation number, there are some rules you have to remember. For any Group 1 or 2 elements that are in the compound, the oxidation number should be the charge of the element. Oxygen is usually two (unless it's in a peroxide or bonded to a fluorine). The main oxidation numbers that you'll have to calculate are of the transition metals, so what you have to do is add up all the known charges and compare it to the overall charge of the compound to calculate the unknown oxidation number.
To find the coordination number, you need to look at how many ligands are connected to the central atom. For example, in the compound [CuCl2]-, the coordination number is 2. There are 2 Cl atoms around the Cu atom. Another example would be Ba[FeBr4]2. Since you only count whats on the inside of the brackets(what bonds to the metal), the coordination number would be 4. There are 4 Br atoms attached to the central Fe atom.
To find the coordination number you have to find the number of bonds connected to the central atom. The oxidation number can be found by comparing the overall charge to the known charges that can be found in the molecule. For example if the overall charge of a molecule is -2 and the known charges add up to 0 then the oxidation number of the central atom would be -2.
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