Memory Game The atom & periodic table Online version Match the pairs! by Nikita Fitzpatrick This experiment helped to discover the mass to charge of an electron Thomson used this device to determine that cathode rays have a - charge George Stoney gave this a name..... The spectrum gained when light is emitted through electron movement down levels The spectrum gained when light is absorbed William Crookes used this to help to discover cathode rays Put forward a theory for the atom based on the element hydrogen A image taken in the same region of light as the Paschen series