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For more info visit http://jeemains2018.in Subatomic Particles: Name Symbol Approximate relative mass Mass in kg Mass in amu Charge (coulomb) Actual Charge (e.s.u) Electron e1/1836 9.109×10–31 5.485×10–4 1.602×10–19 4.8 × 10–10 Proton p 1 1.673×10–27 1.007 1.602×10–19 4.8 × 10–10 Neutron n 1 1.675×10–27 1.008 0 0 Atomic Models: Thomson’s Atomic Model (Plum – pudding model):- Postulate: -Atom is a sphere of positive charge in which number of electrons are embedded. Limitations: - Could not satisfacto