From the University of Hawai'i: "The Representative Elements are those elements within the first two families (Groups I and II on the far left) and the last six families or groups (on the right) of the Periodic Table. "
Basically everything not a transition metal. It's shotty wording, but truth be told most outlines are. They are not usually designed to be read by students.
David D, MD - USMLE and MCAT Tutor
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