Discoveries of isotopes and isobars contradict some of the postulates of ______ the atomic theory.

Bohr's

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Dalton's

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Rutherford's

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Thomson's

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Solution

The correct option is A Dalton's
According to Dalton's atomic theory, atoms of same elements are identical in all respects whereas atoms of different elements are different in all respects. But the discovery of isotopes revealed that atoms of the same element can have different mass. Discovery of isobars contradict the above two postulates of Dalton's atomic theory.

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Similar questions

(a) Where is the nucleus of an atom situated ?

(b) What are orbits or shells of an atom ?

(c)What are isotopes ? How does the existence of isotopes contradict Dalton's atomic theory ?

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