Problem: Arrange the following isoelectronic series in order of decreasing radius: F-, N3-, O2-, Mg2+, Na+Rank ions from largest to smallest. 

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We’re being asked to arrange the given isoelectronic series in order of decreasing ionic 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

Arrange the following isoelectronic series in order of decreasing radius:

 F-, N3-, O2-, Mg2+, Na+

Rank ions from largest to smallest. 


Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Periodic Trends: Ionic Radius concept. You can view video lessons to learn Periodic Trends: Ionic Radius. Or if you need more Periodic Trends: Ionic Radius practice, you can also practice Periodic Trends: Ionic Radius practice problems.

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Our tutors rated the difficulty ofArrange the following isoelectronic series in order of decre...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 2 minutes and 41 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Jones, Auzanneau & deLaat's class at University of Guelph.