Chemistry Practice Problems Periodic Trends: Ionic Radius Practice Problems Solution: Which ion below has the greatest radius?A. Li+ B. ...

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Solution: Which ion below has the greatest radius?A. Li+ B. Na+ C. S2-D. Cl-E. Ca2+

Problem

Which ion below has the greatest radius?

A. Li+ 

B. Na+ 

C. S2-

D. Cl-

E. Ca2+

Solution

We’re being asked to determine the ion with the greatest 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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