|It was in inorganic chemistry that his most
celebrated discoveries were made. As early as 1885-1890 he published
several notable papers on the oxides of nitrogen and followed those up
with the discovery of argon, helium, neon, krypton, and xenon. He won the
Nobel Prize in Chemistry in 1904.
Sir William Ramsay, K.C.B., F.R.S.
Memorials of his Life and Work by Sir William A. Tilden, F.R.S. (1918) (pdf)