Define representative elements
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The Periodic Table of Elements as it is known today was developed by Russian chemist Dmitri Mendeleev and first presented in the German chemistry priodical Zeitschrift f?r Chemie in 1869. Mendeleev had originally created his “Periodic System” by writing properties of the elements onto pieces of cards and arranging them in order of increasing atomic weight
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the Representative elements are those elements with in the first two families (groups1 and 2 on the far left) and the last six families or and groups (on the rightof the periodic table the transition metals are the elements in those group spirit in the middle of the table
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