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 янв 1892 г. – 16 июл 1892 г.)
Добавлено на ленту времени:
Дата:
1 янв 1892 г.
16 июл 1892 г.
~ 6 months