1 janv. 1829 - John Dobereiner P2
Description:
John Dobereiner was a German scientist who developed the Law of Triads. Each was a group of three elements similar to each other. In 1829, he noticed that bromine, element that fell about halfway between chlorine and iodine in atomic weight, also seemed halfway between them in its other properties. Other “triads” that he discovered were: calcium, strontium, and barium, and sulfur, selenium, and tellurium.Ajouté au bande de temps:
Date:
1 janv. 1829
Maintenaint
~ Il y a 196 ans