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Robert Boyle
Robert Boyle published "The Sceptical Chymist" which was a treatise on the distinction between chemistry and alchemy. It also contained some of the earliest ideas of atoms, molecules, and chemical reaction marking the beginning of the history of modern chemistry -
Jakob Berzelius
Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements in the periodic table. he also determined the exact elementary constituents of large numbers of compounds -
John Newlands
John Newlands discoverd that if the elements were to be arranged in the order of their atomic weights, those having consecutive numbers frequently either belong to the same group or occupy similar positions in different groups, and he pointed out that each eighth element starting from a given one is in this arrangement a kind of repetition of the first. -
Dmitri Mendeleev
Dmitri used John Newlands grouping and organized the elements into what is know as the periodic table. He used the atomic mas as the primary characteristic to decide where each element belonged in his table. The elements where arranged in rows and columns. He even left spaces for elements to be discovered because of the pattern he saw once he started organizing those elements known att the time. -
William Ramsay
William Ramsay discovered the rare Nobel Gasses, he also predicted that dense gasses were hidden, invisible and undetected in the Earth's atmosphere. -
Ernest Ruthford
Ernest Ruthfrod discovers the proton. This lead to the understanding that elements should be ordered in the periodic table by atomic number, not atomic weight. -
Henry Moseley
Henry Moseley changed the periodic table to what is todays one as the elements are based on the atomic number he did this with the discovery of isotopes of the elements, it became clear that atomic weight was not the significant player in the periodic law as other scientist thought it was. -
James Chadwick
James Chadwick proved the existence of neutrons - elementary particles devoid of any electrical charge. In contrast with the helium nuclei (alpha rays) which are charged, and therefore repelled by the considerable electrical forces present in the nuclei of heavy atoms.
