(1852–1916), Scottish chemist, discoverer of the noble gases. He first discovered argon, helium, and (with the help of M. W. Travers, 1872–1961) neon, krypton, and xenon, determining their atomic weights and places in the periodic table. In 1910, with Frederick Soddy and Sir Robert Whytlaw-Gray (1877–1958), Ramsay identified the last noble gas, radon. Nobel Prize for Chemistry (1904).