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 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 Thomson used this device to determine that cathode rays have a - charge The spectrum gained when light is emitted through electron movement down levels The spectrum gained when light is absorbed George Stoney gave this a name..... William Crookes used this to help to discover cathode rays