Coordination Number

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rachelle1K
Posts: 109
Joined: Sat Sep 07, 2019 12:16 am

Coordination Number

Postby rachelle1K » Tue Dec 03, 2019 11:38 am

How can I determine the coordination number without drawing the Lewis Structure?

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

Re: Coordination Number

Postby Ryan Chang 1C » Tue Dec 03, 2019 11:45 am

You can attempt to visualize the molecule, but your safest bet is drawing the lewis structure every time. For example, you can infer that CH4 has a coordination number of 4 since the 4 hydrogens are attached to the central atom Carbon.

605208780
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

Re: Coordination Number

Postby 605208780 » Tue Dec 03, 2019 12:07 pm

Your best bet is to identify the central atom in the chemical formula (usually a transition metal) and then adding the number of atoms of the nearest atom/molecule/ions connected to it

Leila_4G
Posts: 114
Joined: Sat Sep 14, 2019 12:17 am

Re: Coordination Number

Postby Leila_4G » Tue Dec 03, 2019 8:49 pm

So, just to be clear, the coordination number is always the same as the areas of high electron population, right?

Vincent Leong 2B
Posts: 207
Joined: Fri Aug 09, 2019 12:15 am

Re: Coordination Number

Postby Vincent Leong 2B » Wed Dec 04, 2019 12:13 am

just count the number of things around the transition metal complex. Lone pairs count towards coordination numbers but there are never lone pairs around the transition metal complex (at least as far as I've seen). So your best bet will be to ask: "how many atoms are bonded to the transition metal?" and that'll give you your coordination number

Kristina Rizo 2K
Posts: 105
Joined: Wed Sep 18, 2019 12:19 am

Re: Coordination Number

Postby Kristina Rizo 2K » Wed Dec 04, 2019 10:18 am

Vincent Leong 1A wrote:just count the number of things around the transition metal complex. Lone pairs count towards coordination numbers but there are never lone pairs around the transition metal complex (at least as far as I've seen). So your best bet will be to ask: "how many atoms are bonded to the transition metal?" and that'll give you your coordination number

so the coordination numbers are the total number of ligands bonded to the central atom?

Caroline Zepecki
Posts: 101
Joined: Fri Aug 09, 2019 12:16 am

Re: Coordination Number

Postby Caroline Zepecki » Wed Dec 04, 2019 10:53 am

Pretty much the number of bonds that the coordination compounds has formed is the coordination number.


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