J. J. Thomson's Life (28 dez 1856 ano – 30 ago 1950 ano)

Descrição:

Thomson began studying positively charged ions. This led to one of his famous discoveries in 1912, when he channeled a stream of ionized neon through a magnetic and an electric field and used deflection techniques to measure the charge to mass ratio. By doing that, he discovered that neon was composed of two different kinds of atoms, and proved the existence of isotopes in a stable element. This was the first ever use of mass spectrometry.