Question

why jhon Dalton theory -(atom of the same elements may have different masses )gone wrong​

Answer 1

Answer:

Part two of Dalton's theory had to be modified after mass spectrometry experiments demonstrated that atoms of the same element can have different masses because the number of neutrons can vary for different isotopes of the same element.

Explanation:

I hope it's right

Answer 2

Answer:

he did not give correct position to isotopes