Science 9th state syllabus Lesson. Structure of atom
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atom consists of sub-atomic particles called protons neutrons and electrons
atom consists of indivisible particles said by John Dalton
proton was discovered by ernest Rutherford in 1920.
Neutron was discovered by James chadwick in 1932.
electron was discovered by j.j Thomson
electron is a negatively charged particle in an atom.
proton is a positively charged ion in an atom
Neutron is not a charged ion it not consists of any mass.
The electrons revolve around the nucleus in an atom.
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