Any chemical reaction in which the oxidation number of an atom,molecule,or ion changes by gaining or losing an electron
hydrogen (H2),and oxygen (O2),, that is the answer
Answer:
Antoine Lavoisier.
Explanation:
I would say that it's the 18th century French chemist Lavoisier. He can arguably be called the father of modern chemistry. He proved the law of the conservation of mass and had a large part in developing the scientific method.