What discovery of j. j. thomson won him the nobel prize in physics in 1906?

He discovered the electron in 1906. i'm pretty sure this is right.

Zimmerman telegraphy: Germany telling Mexico to attack us so we would be distracted from entering a war in Europe. Unrestricted submarine ware fare: Germans sinking US merchant ships and Securing loans: we have the U.K. Big loans during the war and if they lost they couldn't repay us