With the discovery of isotopes,which postulate of Dalton's original atomic theory must be modified?
A)Matter is made up of atoms.
B)Atoms combine with other atoms in whole number ratios to form compounds.
C)All atoms of the same element are the same.
D)In chemical reactions, the arrangement of atoms is changed.

Question

Quizplus · Accepted Answer

The discovery of isotopes shows that atoms of the same element can have different numbers of neutrons, leading to different atomic masses. This contradicts Dalton's original postulate that all atoms of the same element are the same.

With the Discovery of Isotopes,which Postulate of Dalton's Original Atomic