central atoms

(Polar molecules, Non-polar molecules, etc.)

Moderators: Chem_Mod, Chem_Admin

EMurphy_2L
Posts: 128
Joined: Sat Sep 07, 2019 12:16 am

central atoms

Postby EMurphy_2L » Mon Nov 11, 2019 9:46 pm

how do you know the central atom since it's not always that with lowest ionization energy?
For example, why is Cl the central atom in ClO2+ ?

Tiffany Dong_4e
Posts: 51
Joined: Wed Sep 11, 2019 12:17 am

Re: central atoms

Postby Tiffany Dong_4e » Mon Nov 11, 2019 10:28 pm

The central atom is typically determined by whichever atom has the lowest electronegativity. Aside from this, the atom which is alone or has the lowest quantity is usually in the center.

Shutong Hou_1F
Posts: 117
Joined: Sat Sep 14, 2019 12:17 am

Re: central atoms

Postby Shutong Hou_1F » Mon Nov 11, 2019 11:11 pm

According to the information I collected online, the first ionization energy of oxygen is 1313.94 kJ/mol and that of chlorine is 1251.19 kJ/mol. So the ionization energy of Cl is lower than that of oxygen, making Cl reasonable to be put as the central atom.

Adelpha Chan 1B
Posts: 58
Joined: Thu Jul 25, 2019 12:15 am

Re: central atoms

Postby Adelpha Chan 1B » Tue Nov 12, 2019 12:09 pm

EMurphy_1L wrote:how do you know the central atom since it's not always that with lowest ionization energy?
For example, why is Cl the central atom in ClO2+ ?


To allow for stability in the molecule/compound, the central atom is the atom with the lower/lowest electronegativity. In this case, oxygen is more electronegative than chlorine.

Mariah
Posts: 104
Joined: Fri Aug 02, 2019 12:16 am

Re: central atoms

Postby Mariah » Tue Nov 12, 2019 12:27 pm

Tiffany Dong_4e wrote:The central atom is typically determined by whichever atom has the lowest electronegativity. Aside from this, the atom which is alone or has the lowest quantity is usually in the center.


This is probably the best rule to follow! Try not to over complicate it because it may confuse you more.

EricZhao3G
Posts: 51
Joined: Tue Oct 08, 2019 12:16 am

Re: central atoms

Postby EricZhao3G » Tue Nov 12, 2019 3:34 pm

You are right that the atom with the lowest ionization energy is the central atom. In that example, oxygen has a higher electronegativity than chlorine so chlorine is the central atom.

Siddiq 1E
Posts: 106
Joined: Fri Aug 09, 2019 12:15 am

Re: central atoms

Postby Siddiq 1E » Tue Nov 12, 2019 4:06 pm

Atoms with higher electronegativity tend not to be central atoms. They are on the outside so they have more electrons to themselves

BCaballero_4F
Posts: 94
Joined: Wed Nov 14, 2018 12:22 am

Re: central atoms

Postby BCaballero_4F » Tue Nov 12, 2019 5:56 pm

Cl is the central atom because it allows for stability


Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 3 guests