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Class 9 science study material of sciencephysicsbiology. Punjab chemistry online 9th class test lesson 2 structure of atom, an atom is and invisible, hard dense sphere, atoms of the same element are alike, atoms combine in different ways to form a compound. Millikan 18681953 devised a method known as oil drop experiment 190614, to determine the charge on the electrons. Master class 9 science notesand be successful in exams.
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