Chemistry Practice Problems Periodic Trends: Ionic Radius Practice Problems Solution: Which of the following ions has the largest radius...

Solution: Which of the following ions has the largest radius?A) Ca2+B) Ga3+C) K+D) Li+E) Na+

Problem

Which of the following ions has the largest radius?

A) Ca2+

B) Ga3+

C) K+

D) Li+

E) Na+

Solution

Establish the trend for ionic radius and determine the ion with the largest radius among the choices. 


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 an 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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