Antoine Lavoisier was a French chemist conducted many experiments on gases and discovered the role of oxygen in combustion, from this work he devised the law of conservation of mass. He also discovered many new elements
The modern Atomic Model was first developed by two key scientists Lavoisier and Dalton with the help of others. They formulated the key concepts of the law of conservation of mass and the existence of atoms as the building blocks of all matter using their knowledge of chemical reactions.