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Reference.org
Actinide contraction
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<p>The actinide contraction is the greater-than-expected decrease in <a href="/facts/Atomic_radii/0mQaIJX9">atomic radii</a> and <a href="/facts/Ionic_radii/C3dwKrrB">ionic radii</a> of the <a href="/facts/Chemical_element/0jducgWD">elements</a> in the <a href="/facts/Actinide/kHC4lxJV">actinide</a> series, from left to right. </p>