Periodic Table

General purpose of this lecture is to describe on Periodic Table. Periodic Table is a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns. Demitri Mendeleeve (Russian – 1869) was published the first periodic table, based on atomic mass. here also focus on Periodic Law: modern periodic table organized according to atomic number. Finally describe on Metallic Character, Classifying the Elements, Atomic Radius, Ionization Energy and Electronegativity.