Chemistry Practice Problems Periodic Trends: Ionic Radius Practice Problems Solution: Which of the following atoms/ions would have the s...

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

Problem

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

A. P3− 

B. S2− 

C. Ar 

D. K+

E. Cl

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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