Simplify the following text for a Grade 11 native English-speaking person.
Original: This definition has now been adopted by IUPAC and corresponds to including only Groups 3-11 as transition metals . Group 12 metals lack the characteristic chemical and physical properties associated with incomplete d subshells and are considered post-transition metals .
Simplified: The Group 12 elements are normally called post-transition metals because they are different from the transition metals .