William Ramsay was a Scottish chemist awarded the 1904 Nobel Prize in Chemistry for his discovery, prompted by a suggestion from Lord Rayleigh (1882), of all noble gases, including (with Frederick Soddy) helium, although it had been earlier detected in the solar spectrum (1868). Ramsay was also interested in radioactivity and showed that helium is produced by radioactive decay. He was knighted in 1902.