Problem: Sort the following Group 3A(13) elements in order of increasing atomic radius.

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The Periodic table below shows the trend for atomic radius. The elements mentioned in the question are also encircled. We can see that the elements are all in one column so it's fairly easy to arrange them according to the trend which is decreasing from bottom to top:

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Problem Details

Sort the following Group 3A(13) elements in order of increasing atomic radius.