Antoine Lavoisier

Birth: August 26, 1743
Death: May 8, 1794
Nationality: French
Occupations: Lavoisier was a noble prominent in the histories of chemistry and biology.
How the element oxygen was discovered: He didn't discover oxygen but he recognized and named it.
Other accomplishments: He also recognized and named hydrogen. He stated the first version of the law of conservation of mass, abolished the phlogiston theory, helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature. He discovered that, although matter may change its form or shape, its mass always remains the same. He conducted many experiments in biology and chemistry.