Discovery of subatomic particles Tamil revision mind map presented as a horizontal zig-zag timeline: 1886 Goldstein observing canal rays leading to proton identification confirmed by Rutherford in 1919, 1897 J.J. Thomson discovering the electron via cathode rays with charge-to-mass ratio constant across all gases, 1913 Henry Moseley establishing atomic number from X-ray emission spectra as the true basis of elemental identity, and 1932 James Chadwick discovering the neutron by bombarding beryllium with alpha particles, closing with why proton and neutron mass dominate atomic mass while electron mass and orbital spread determine atomic volume.
↔️ முழுப் படத்தையும் காண பக்கவாட்டில் நகர்த்துக (scroll to see full poster)