Question: what year were the noble gases discovered?
Answer: Ramsay discovered most of the remaining noble gases--argon in 1894 (with Lord Rayleigh) and krypton, neon, and xenon in 1898 (with Morris M. Travers). Radon was discovered in 1898 by Fredrich Ernst Dorn. Occurrence: Helium comes from natural gas deposits within Earth and can be isolated from air.