26 jun 1799 año - Law of definite proportion
Descripción:
Joseph Louis Proust proposed this law that stated that" the masses of elements in a compound always occur in the same proportion".
Source:
https://www.thoughtco.com/history-of-atomic-theory-4129185
Añadido al timeline:
fecha:
26 jun 1799 año
Ahora mismo
~ 226 years ago