Question

what was the basis of the early attempts made for classification and grouping of element

Answer 1

the basis of the early attempts made for classification and grouping of element was atomic mass

Answer 2

the first attempt by Dobernier was in 1817 to classify elements to a group of 3 was on the basis of their properties . Newlands later on found  that every 8th element has properties similar to the first one and called them Newland octaves