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I have a test on atomic radii on Monday, I'm going through the study guide, and one type of problem eludes me.
I understand that atomic radius increases downward and left of the periodic table, but what if one element is lower on the periodic table than the other, but the other element is further to the left? How can I tell which element has the larger atomic radius? Which element has the higher atomic radius? This sounds difficult to picture, I'll give examples.
Polonium (Po) Ra=190pm and Indium (In) Ra=167pm
Iodine (I) Ra=140pm and Potassium (K) Ra=227pm
In both cases, the first element is lower on the periodic table and the second element is further to the left on the periodic table.
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