Hope M. answered 03/06/16
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The following answers apply to Chemistry:
A radical is an atom, ion, or molecule that has unpaired electrons.
An element is a substance made up of the same type of atoms.
A compound is a combination of two or more elements.
Based off these definitions, we know that radicals, elements, and compounds biggest difference is there size. We know this because an element is a combination of atoms, and a compound is a combination of elements.