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Answer» Bohr's DALTON's Rutherford's Thomson's
Solution :Accordingto Dalton s atomic theory, ATOMS of same elements aré identical in all respects, whereas atoms of DIFFERENT elements are different in all respects. But discoirery of ISOTOPES revealed that atoms of same element can have different mass. Discovery of ISOBARS revealed that atoms of different eIements can have same mass. These discoveries of isotopes and isobars contradict the above two postulates of Dalton s atomic theory
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