Problem: Rank the following ions from largest to smallest ionic radius Se2-, Y3+, Rb+, Br-, Mo6+

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We’re being asked to rank the following ions from largest to the smallest ionic radius

Recall that ionic radius is the size of an ion

  • The trend for the ionic radius is as follows: 
    • it increases from right to left and down a period in the periodic table.
  • Ionic radius also increases with the increasing number of electrons.

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Problem Details

Rank the following ions from largest to smallest ionic radius 

Se2-, Y3+, Rb+, Br-, Mo6+

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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.