Atom · Smallest particle of an element that can take part in - TopicsExpress

Atom · Smallest particle of an element that can take part in chemical reaction · Atoms are made up of electrons, protons and neutrons. · Electron (–e0) has negative charge (discovered by J.J Thomson in 1897), charge on electron = 1.6 × 10–19 coulomb. Mass of electron = 9.1 × 10–28 gram · The magnitude of negative charge on electron was determined by Milikan. · Proton (1H1) has positive charge (discovered by E. Goldstein) · Charge on proton (1H1) = 1.6 × 10–19 coulomb · Mass of proton (1H1) = 1.6 × 10–24 gram · Neutron (0n1) has no charge (discovered by Chadwick) · Mass of neutron (0n1) = 1.6 × 10–24 gram

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