Who Created It?• The periodic table was created by Dmitri Mendeleev between 1868 and 1870.
Why Was It Created? • Mendeleev was a professor and claimed that he could not ﬁnd a proper text book. • This was during the time when he came up with his chemical and physical theory. • He decided to develop a table of elements.
How Is It Organized?• Each Horizontal row is a period.• Each vertical row is a group.• Every element in the same period or group has something in common with the others.• The elements are arranged in order from smallest atomic mass to largest.