Problem: Which of the following atoms/ions would have the smallest radius?A. P3− B. S2− C. Ar D. K+E. Cl−

FREE Expert Solution

We’re being asked to determine the ion with the smallest radius


Recall that ionic radius is the size of an ion. The trend for ionic radius is as follows: it increases from right to left and down a period in the periodic table. Ionic radius also increases with increasing number of electrons.


For this problem, we need to do the following:

Step 1: Determine the electrons in each species.

Step 2: Compare the charges if they are isoelectronic.


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Problem Details

Which of the following atoms/ions would have the smallest radius?

A. P3− 

B. S2− 

C. Ar 

D. K+

E. Cl

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Periodic Trends: Ionic Radius concept. You can view video lessons to learn Periodic Trends: Ionic Radius. Or if you need more Periodic Trends: Ionic Radius practice, you can also practice Periodic Trends: Ionic Radius practice problems.