-
Robert Boyle
Robert Boyle suggested that an element was a substance that cannot be broken down any further by chemical reaction. He wrote two books on chemistry (New Experiments Physico-Mechanicall, Touching the Spring of the Air, and Its Effects) and the second,(New Experiments Physico-Mechanicall, Touching the Spring of the Air, and Its Effects Second edition) was where he discussed the elements. -
Antoine Lavoisier
Antoine Lavoisier made a detailed list of substances that he believed to be elements. He had 33 elements in his table.He recognised and named oxygen (1778) and hydrogen (1783) and opposed the phlogiston theory. -
Jakob Berzelius
Jakob Berzelius used symbols to do with the name of the chemical to make it easier to identify them. he also used the weight of hydrogen to develop a coherent system of atomic weights. -
Johann Döbereiner
Johann Döbereiner was awar of 40 elements in1829. he noted that some groups of three had similar properties and named these groups triads -
John Newlands
John Noted that every eighth element had similar properties. He named it the 'law of octaves'. -
William Ramsay
William Ramsay separated the components of air.he identified: helium, neon, argon, krypton and xenon. all these gasses are called noble gasses. -
Henry Moseley
Henry refined the order of some of the elements in mendeleevs periodic table and proposed a minor change to the periodic law: 'elements have properties that recur according to their atomic number.' -
Glenn Seaborg
glenn Seaborg used a cyclotron to slam neutrons into uranium atoms. this created the very first atoms of neptunium and plutonium. he later discovered: americium, curium, berkelium, californium, einsteinium etc.
