## homework 2.59

tatianatumbling_1J
Posts: 31
Joined: Mon Jan 08, 2018 8:19 am

### homework 2.59

I am confused on the answer to 2.59.
the question says to rank the ions from smallest to largest ionic radius. S2-, Cl-, and P3-
I thought the answer would be the all have the same ionization energy because they all end up on Ar on the periodic table after adding electrons. but the solution is P3-,S2-,Cl-

can someone explain what I am misunderstanding?

annie_finneran_1K
Posts: 37
Joined: Fri Apr 06, 2018 11:02 am

### Re: homework 2.59

go to the chem website and click solution manual errors. but also they do not have the same ionic radius, because ionic radius decreases across a period and those elements are all in the same period

Posts: 30
Joined: Fri Apr 06, 2018 11:03 am
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### Re: homework 2.59

Atomic radii decrease across a period and since P3- appears first it has the greatest atomic radii and S2- and Cl- appear after it respectively on the periodic table meaning that their atomic radii are less than it. Therefore, since it asks for increasing atomic order it would be Cl- < S2- < P3-
I don't think for the distance of atomic radii you take into account the electron configuration only where it is on the periodic table.
Hope this helps

tatianatumbling_1J
Posts: 31
Joined: Mon Jan 08, 2018 8:19 am

### Re: homework 2.59

Adela Henry 1I wrote:Atomic radii decrease across a period and since P3- appears first it has the greatest atomic radii and S2- and Cl- appear after it respectively on the periodic table meaning that their atomic radii are less than it. Therefore, since it asks for increasing atomic order it would be Cl- < S2- < P3-
I don't think for the distance of atomic radii you take into account the electron configuration only where it is on the periodic table.
Hope this helps

that makes more sense, thank you!

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