William Ramsay (NOBLE GAS) He discovered helium, which since 1868 had been known to exist, but only in the sun. This second discovery led him to suggest the existence of a new group of elements in the periodic table. He and his coworkers quickly isolated neon, krypton, and xenon from the earth’s atmosphere. (jan 1, 1892 – jul 16, 1892)
Added to timeline:
Date:
jan 1, 1892
jul 16, 1892
~ 6 months