5.1 CLASSIFICATION OF ELEMENTS 133 Figure 5.1 Mendeleev's Classification of the Elements (1871) The formula for the Group I II III IV V VI VII VIII Formula oxide of an element is indi- of Oxide R20 RO R2O, RO, R;O; RO, R20, RO, cated by the notation R20, RO, and so on. For example, GroupI oxides include Li,O, Naz0, and K2O;and Group Il oxides include Beo, Mgo, and Cao. In Groups II and IV, Mendeleev indicated the existence of three undiscovered elements, which he named ekaboron, ekaaluminum, and ekasilicon. H Li Be B N F Na Mg Al Si CI K Ca eka- Ti V Cr Mn Fe, Co Cu Zn eka- eka- As Se Br & Ni Rb Sr Y Zr Nb Мо Ru, Rh Ag Cd In Sn Sb Te I & Pd Ba Di Ce Er La Та Os, Ir Au Hg TI Pb Bi & Pt Th U

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