Question

what are isotops?how does the existence of isotops contradict dalton 's atomic theory
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Answer 1

Answer:

atom of same element having same atomic no. but different mass no.

2nd part :- because dalton said all atoms of given element are identical and have same mass size and chemical properties.

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Answer 2

Answer:

isotopes are the substances having same atomic no. but different atomic masses.

eg. cl has two isotopes having masses 35 & 37 .

According to Dalton, the atoms of same element are similar in all respects. However, isotopes of some elements vary in their masses and densities. Therefore it contradicts Dalton atomic theory.

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