Ionic Radius

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Nathan Mariano 2G
Posts: 68
Joined: Fri Sep 28, 2018 12:29 am

Ionic Radius

Postby Nathan Mariano 2G » Fri Nov 02, 2018 9:32 pm

Arrange S^-2, Cl-1, P-3 in order of increasing ionic radius. The correct order according to the textbook of increasing ionic radius is Cl^1-,S^2-,P^3-. Why is it in that order? My thought process is the same as atomic radius: as you add valence electrons, the ionic radius decreases. Using that process, I would get P^3-,S^2-,Cl^1-.

Nancy Hu - 4E
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

Re: Ionic Radius

Postby Nancy Hu - 4E » Fri Nov 02, 2018 11:16 pm

The order of increasing ionic radius is Cl^1-,S^2-,P^3- because even though they have the same electron configuration, the smaller ions are the ones with the larger atomic number because they have the most positive charge in the nucleus because of the number of protons and so they have the largest pull on the electrons.

Brian Kwak 1D
Posts: 88
Joined: Fri Sep 28, 2018 12:17 am

Re: Ionic Radius

Postby Brian Kwak 1D » Sat Nov 03, 2018 8:45 pm

From my limited understanding Protons are what you should be mainly concerned about because the protons are what gives a positive charge for the electrons to be attracted to. Therefor the more protons the higher the positive charge and therefor electrons will be closer to the nucleus.


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