Coordination number

Moderators: Chem_Mod, Chem_Admin

Priscilla Okaiteye
Posts: 61
Joined: Tue Nov 21, 2017 3:02 am

Coordination number

Postby Priscilla Okaiteye » Sun Jun 10, 2018 3:53 pm

Can someone just briefly explain to me what the coordination number is and how to find it?

Priscilla Okaiteye
Posts: 61
Joined: Tue Nov 21, 2017 3:02 am

Re: Coordination number

Postby Priscilla Okaiteye » Sun Jun 10, 2018 3:54 pm

...and maybe also show an example?

Jocelyn Fermin1J
Posts: 49
Joined: Tue Nov 14, 2017 3:01 am

Re: Coordination number

Postby Jocelyn Fermin1J » Sun Jun 10, 2018 4:31 pm

The number of atoms attached to the central atom, this does not include lone pairs. double bonds and triple bonds only count as 1 for example

SO2 coordination number=2
Attachments
SO2.jpeg
SO2.jpeg (3.3 KiB) Viewed 389 times

Luis Torres 1C
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

Re: Coordination number

Postby Luis Torres 1C » Sun Jun 10, 2018 6:13 pm

As stated above, the coordination number indicates the number of atoms that surround the central atom. To add to that answer, these 'non-central' atoms are called ligands

ErinKim1I
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

Re: Coordination number

Postby ErinKim1I » Sun Jun 10, 2018 6:41 pm

Just to add, coordination number typically applies to compounds with a transition metal as the central atom, so it isn't likely that you would encounter a double or triple bond in the first place.

Anthony Mercado 1K
Posts: 27
Joined: Fri Apr 06, 2018 11:04 am

Re: Coordination number

Postby Anthony Mercado 1K » Sun Jun 10, 2018 8:44 pm

While I understand that the coordination number denotes the number of ligands attached to a central atom, what importance does this serve to discover any further aspects of the molecule involved?

Jennifer Lathrop 1F
Posts: 71
Joined: Sat Dec 02, 2017 3:00 am

Re: Coordination number

Postby Jennifer Lathrop 1F » Wed Nov 28, 2018 11:00 am

Can the term coordination number apply to all molecules? or only some?

705137650
Posts: 16
Joined: Fri Sep 28, 2018 12:18 am

Re: Coordination number

Postby 705137650 » Wed Nov 28, 2018 11:11 am

the number of atoms or ions immediately surrounding a central atom in a complex or crystal.

Dana Wilks 3I
Posts: 30
Joined: Fri Sep 28, 2018 12:23 am

Re: Coordination number

Postby Dana Wilks 3I » Wed Nov 28, 2018 11:29 am

Jocelyn Fermin1J wrote:The number of atoms attached to the central atom, this does not include lone pairs. double bonds and triple bonds only count as 1 for example

SO2 coordination number=2


Like Jocelyn said, it does not include lone pairs. On a related note, though, the steric number include the number of atoms bonded plus the number of lone pairs on a central atom. This number is useful in VSEPR to determine the electron arrangement.

Hannah Yates 1K
Posts: 59
Joined: Fri Sep 28, 2018 12:27 am

Re: Coordination number

Postby Hannah Yates 1K » Fri Nov 30, 2018 6:11 pm

Jennifer Lathrop 3E wrote:Can the term coordination number apply to all molecules? or only some?


I’m pretty sure a coordination number can only apple to coordination compound, which is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds.

Karla_Ocampo 4E
Posts: 32
Joined: Tue Nov 21, 2017 3:01 am

Re: Coordination number

Postby Karla_Ocampo 4E » Fri Nov 30, 2018 6:46 pm

Hi! The coordination number is just the number of atoms attached to the central atom. However as someone stated, don't count lone pairs.


Return to “Naming”

Who is online

Users browsing this forum: No registered users and 2 guests