Antoine-Laurent LAVOISIER (1743-1794) Portrait of Lavoisier with the wife; that it documented with designs from the true one; the experiences of laboratory of the husband. Chemical French member of the Academy of Sciences; enunciated the first version of the conservation law of the mass; recognized and christened oxygen (1778); hydrogen and nitrogen; made deepened studies on the combustion of gases; refuting the theory of the flogisto; and helped to reform the chemical nomenclature. Lavoisier often comes indicated like the father of modern chemistry. Painting executed from Jacques-Louis David; 1788