[Holdem Or Foldem]

Five main points of Dalton's atomic theory Elements are made of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed. Atoms of different elements combine in simple whole-number ratios to form chemical compounds. In chemical reactions, atoms are combined, separated, or rearranged.Various atoms and molecules as depicted in John Dalton's A New System of Chemical Philosophy (1808)

[Holdem Or Foldem]

Sorry, I tried a new way of posting and it did not post as I thought I had it arranged. The bottom line is that John Dalton had Mendeleev beat by almost 60 years withe his table of elements. It was very primitive but useful. Dalton is regarded as the father of “modern” atomic theory and did his work in the first decade of the nineteenth century.