Sir Francis Bacon published "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific method.
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
Henry Cavendish discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air
Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals
John Dalton proposed "Dalton's Law" describing the relationship between the components in a mixture of gases.
Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements