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. (1 gen 1892 anni – 16 lugl 1892 anni)
Aggiunto al nastro di tempo:
Data:
1 gen 1892 anni
16 lugl 1892 anni
~ 6 months