Jul 23, 1916 - Death of William Ramsay, discovers the 6 noble gases of the periodic table

In 1892, John William Strutt, better known as Lord Rayleigh, discovered a difference in the data for nitrogen gas in compounds and in the atmosphere which he attributed to a light gas included in chemical compounds of nitrogen, whereas Ramsay suspected it was of a hitherto unknown heavy gas. After using two different methods to remove all known gases from the air, both were able to announce in 1894 that they had found a chemically inert, monatomic gaseous element that made up almost 1% of the atmosphere. They named it after the Greek word for "lazy," argon.

In 1893, Ramsay released another inert gas from a mineral called cleveite, which turned out to be helium.

In 1896, he published "The gases of the atmosphere" in which he indicated that due to the positions of helium and argon in the periodic table, there could be at least three more noble gases.

In 1898, working with Morris W. Travers, he isolated the elements neon, krypton, and xenon from the air and, in 1903, working with Frederick Soddy, he demonstrated that helium (along with a gaseous emanation called radon) is continuously produced during the radioactive decay of radium. It was a discovery of great importance for the understanding of nuclear reactions.

In 1910, using small samples of radon, he showed that it is a sixth noble gas and provided further evidence that it was formed by the emission of a helium nucleus and from radium.

He was named Sir in 1902 and two years later received the Nobel Prize in Chemistry for discovering the components of air and determining their location on the periodic table of elements. Interestingly, his collaborator and friend John William Strutt received the Nobel Prize in Physics that same year.

If you want to know more about this scientist, click on the following link: Sir William Ramsay