1 janv. 1817 - Johann Dobereiner
Description:
Put forward the law of triads. The appearance and reaction of each element in the triad were similar to each others. He also discovered that the atomic mass of the middle element was close to the average of the triad.Ajouté au bande de temps:
Date:
1 janv. 1817
Maintenaint
~ Il y a 207 ans
