Problem: Rank these atoms and ions according to radius. K-, K+, K

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Ionic radius → increases with increasing number of electrons.




For K-: The atomic number of K is 19. K- has a charge of -1 which means K gained 1 electron. This means the number of electrons in K- is 19 + 1 = 20 electrons.


For K+: The atomic number of K is 19. K+ has a charge of +1 which means K lost 1 electron. This means the number of electrons in K+ is 19 – 1 = 18 electrons.


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Rank these atoms and ions according to radius. 

K-, K+, K

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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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Based on our data, we think this problem is relevant for Professor McVey's class at TXSTATE.