Levoisier Work: He attempted to classify know elements as metals and non-metals
Dobereiner work: In 1829, Dobereiner grouped the elements into triads(a group of three) with similar properties, noting that the atomic weight of the middle element was roughly the average of other two.
John Newland work: English chemist John Newlands, in 1864, first time observed periodicity in the 62 known elements were arranged in increasing order of their atomic masses. He classified the elements into groups so that every eight elements resemble the first element in properties.
Lother Work: In the same year, Lother Meyer developed his famous curves by plotting a graph between the atomic weight and the atomic volumes of elements. These curves also showed periodicity.
Dmitri Mendeleev work: In 1869, Russian chemist Dmitri Mendeleev, considered the father of the Periodic Table, arranged 63 elements by increasing atomic mass, aligning elements with similar properties into groups.
