How to find coordination number.

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VanessaZhu2L
Posts: 85
Joined: Wed Sep 30, 2020 9:44 pm

How to find coordination number.

Postby VanessaZhu2L » Sun Dec 06, 2020 8:26 pm

Can someone explain how to find coordination number for coordination compounds? Thank you!

Sara_Lim_2C
Posts: 85
Joined: Wed Sep 30, 2020 9:55 pm

Re: How to find coordination number.

Postby Sara_Lim_2C » Sun Dec 06, 2020 8:27 pm

The coordination number is equal to the number of bonds connected to the central atom. Hope that helps!

VanessaZhu2L
Posts: 85
Joined: Wed Sep 30, 2020 9:44 pm

Re: How to find coordination number.

Postby VanessaZhu2L » Sun Dec 06, 2020 8:29 pm

Yes, thank you! Also, does anyone know how to calculate oxidation number?

Bailey Giovanoli 1L
Posts: 103
Joined: Wed Sep 30, 2020 9:50 pm

Re: How to find coordination number.

Postby Bailey Giovanoli 1L » Sun Dec 06, 2020 8:31 pm

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:)

derickngo3d
Posts: 79
Joined: Wed Sep 30, 2020 9:51 pm

Re: How to find coordination number.

Postby derickngo3d » Sun Dec 06, 2020 8:31 pm

The oxidation state of an ion is the charge of that ion. Hope this helps!

Jayasree Peri 2J
Posts: 97
Joined: Wed Sep 30, 2020 10:03 pm

Re: How to find coordination number.

Postby Jayasree Peri 2J » Sun Dec 06, 2020 8:32 pm

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.

Jeremy Wei 2C
Posts: 62
Joined: Wed Sep 30, 2020 9:59 pm

Re: How to find coordination number.

Postby Jeremy Wei 2C » Sun Dec 06, 2020 8:51 pm

Hi, you can find the coordination by counting the number of bonds connected to the central metal atom. Hope that helps!

Hana Sigsbee 3B
Posts: 90
Joined: Wed Sep 30, 2020 10:00 pm

Re: How to find coordination number.

Postby Hana Sigsbee 3B » Sun Dec 06, 2020 8:52 pm

the coordination number is equal to the number of bonds attached to the central atom

Lauren Mungo 1K
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Joined: Wed Sep 30, 2020 10:08 pm
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Re: How to find coordination number.

Postby Lauren Mungo 1K » Sun Dec 06, 2020 8:53 pm

The coordination number is the number of bonds to the central atom. Therefore you have to count the bonds, but be careful for polydentate molecules.

Brandon Gruender 3F
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Joined: Wed Sep 30, 2020 10:03 pm

Re: How to find coordination number.

Postby Brandon Gruender 3F » Sun Dec 06, 2020 8:56 pm

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.

Michael Cardenas 3B
Posts: 48
Joined: Wed Sep 30, 2020 9:34 pm

Re: How to find coordination number.

Postby Michael Cardenas 3B » Sun Dec 06, 2020 9:45 pm

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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