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Solution: Which ion has the smallest radius?a. Ca2+b. Cl-c. K+d. S2-

Problem

Which ion has the smallest radius?

a. Ca2+

b. Cl-

c. K+

d. S2-

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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