Class 9 Structure of the Atom Notes

Structure of the Atom Notes Sub atomic particles:- Electron , proton and neutron. Electron was identified by J.J. Thomson in 1897, proton was identified by E. Goldstein in 1886 and neutron was identified by James Chadwick in 1932. The mass of proton is approximately 2000 times as that of the electron. The charges of proton […]