31 juill. 1777 - Antonie De Lavoisier
Description:
Defined the word element as a pure substance that could not be chemically broken down into similar substances. Discovered 23 elements and recognized mixtures exist and identified air as a mixture of oxygen and some other gas.
Ajouté au bande de temps:
Date:
31 juill. 1777
Maintenaint
~ Il y a 247 ans