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.
Answer:C
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.