jan 1, 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.Added to timeline:
Date:
jan 1, 1829
Now
~ 196 years ago