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 ene 1892 año – 16 jul 1892 año)
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1 ene 1892 año
16 jul 1892 año
~ 6 months