William Ramsay lived in the years 1852-1916. In 1894 both he and John Rayleigh both discovered a new element which Ramsay called argon. It didn't compound with any other elements and it didn't fit in the periodic table. The table had to be enlarged by one column. A year later Ramsay discovered another element of that group - helium and in 1898 he isolated all noble gasses occurring in the air; that is: argon, neon, helium, krypton, xenon and in 1910 - radon. Apart from these researches he tried to interpretate the Brownian movements explaining them as collisions of observed bodies and invisible particles of medium.