Periodic Trend: Ionic Radius Video Lessons

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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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