According to Mendeleev, Li, Na and K present in group IA are quite different from ___________.

 According to Mendeleev, the elements placed in the same group must resemble their properties. He placed Cu, Ag, and Au with Li, Na, and K  But later it was found that there is no similarity among the elements in the two sub-groups of this particular group.

According to the Mendeleev periodic table Li, Na, and K present in group IA are quite different from Cu, Ag, and Au which belong to group IB because of their different chemical properties and electronic configuration.