Presentation on theme: "Introduction to the Periodic Table. Dmitri Mendeleev The elements were first arranged in the periodic table in 1869 by Dmitri Mendeleev. By arranging."— Presentation transcript:
Dmitri Mendeleev The elements were first arranged in the periodic table in 1869 by Dmitri Mendeleev. By arranging all of the 63 elements then known by their atomic weights, he managed to organize them into groups possessing similar properties. Where a gap existed in the table, he predicted a new element would one day be found and deduced its properties.
Physical Properties of Nonmetals Brittle Not lustrous Poor conductors of heat & electricity Many nonmetals are gaseous at normal temperatures (N, O, Cl, Ne) One nonmetal is liquid at normal temperatures (Br) Several nonmetals are solid at normal temperatures (C, P, S)