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MCAT Question A Day - 10/13/14 - Answer!

Which of the following increases with increasing atomic number within a family on the periodic table?

A.  electronegativity
B.  electron affinity
C.  atomic radius
D.  ionization energy

C is correct. A family or group is the name for any vertical column on the periodic table. Of the choices given, only atomic radius increases going down a column. Although electron affinity is a possible choice depending upon the definition used, atomic radius is an unambiguous choice.

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