Large Anion + Small Cation

Moderators: Chem_Mod, Chem_Admin

405289292
Posts: 52
Joined: Thu Oct 03, 2019 12:16 am

Large Anion + Small Cation

Postby 405289292 » Mon Nov 04, 2019 4:00 pm

Are large anions more covalent when paired to small cations?

Brian Tangsombatvisit 1C
Posts: 119
Joined: Sat Aug 17, 2019 12:15 am

Re: Large Anion + Small Cation

Postby Brian Tangsombatvisit 1C » Mon Nov 04, 2019 4:40 pm

The ionic bond behaves more covalent when you have a large anion and small cation, since the anion has a lower electronegativity and the cation has a higher electronegativity. This results in covalent-like behaviors since the cation and anion are more likely to share the electrons between them, rather than the anion taking all of the electrons away from the cation.

Matthew Chan 1B
Posts: 111
Joined: Sat Sep 07, 2019 12:16 am

Re: Large Anion + Small Cation

Postby Matthew Chan 1B » Wed Nov 06, 2019 10:44 pm

When there is a large difference in the electronegativity between two elements, the electrons from the large electron dense regions of the large anion are pulled away from that region and (more electrons = more shielding, so electrons are held less tightly) closer to the small cation and the electrons are located in a region generally in the middle area between the two ions, which is a display of covalent character.


Return to “Polarisability of Anions, The Polarizing Power of Cations”

Who is online

Users browsing this forum: No registered users and 1 guest