'By Rutherford in 1919, this particle, 22 years after the electron'
the proton
DISCOVERIES: By Rutherford in 1919, this particle, 22 years after the electron
By Rutherford in 1919, this particle, 22 years after the electron
By Rutherford in 1919, this particle, 22 years after the electron
DISCOVERIES
the proton
DISCOVERIES