(adsbygoogle = window.adsbygoogle || []).push({}); Arranging atoms/ions based on atomic radius

Hey, I'm in a bit of a bind here. I got a question that deals with atomic radius. The question asks to arrange the following atoms/ions in order from smallest to biggest:

[tex]Cl, S^{2-}, K, K^{+}, O[/tex]

I know just by looking at the periodic table that O has the smallest radius and that K has the largest radius... I also know that since [tex]S^{2-}[/tex] is larger than S and since S is larger than Cl that means [tex]S^{2-}[/tex] is also larger than Cl.

[tex]K^{+}[/tex] is smaller than K and larger than Cl since it has a greater energy level.

Here's my problem... I know that both [tex]K^{+}[/tex] and [tex]S^{2-}[/tex] fall somewhere between the Cl and K atoms.... and by looking up the actual radius of the [tex]K^{+}[/tex] and [tex]S^{2-}[/tex] ions I know that the [tex]S^{2-}[/tex] radius is larger than the [tex]K^{+}[/tex] radius but how do i prove this?

Any help would be greatly appreaciated. Thanks!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Arraging atoms/ions based on atomic radius

**Physics Forums | Science Articles, Homework Help, Discussion**