What does Dalton’s atomic theory suggest about atoms of different elements?
They have different masses and properties.
Dalton’s atomic theory states that all atoms of a given element are identical in mass and chemical properties, but atoms of different elements are different from each other. So carbon atoms differ from oxygen atoms in mass and in the way they react, which is how the elements are told apart.
The two claims of identical masses across elements contradict Dalton, and the claim that atoms of every element are the same in every aspect would leave no way to distinguish one element from another. Only the statement that atoms of different elements differ in both mass and properties matches Dalton’s postulate.
Hence, the answer is They have different masses and properties.
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