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Which of the following statements was NOT part of Dalton's hypothesis on the structure of matter.

a. Atoms are made of protons and electrons
b. atoms unite in definite ratios to form compounds
c. all matter is made of atoms.
d. atoms of the same element are identicle.

Answer:
The correct answer is A. Protons and electrons were not discovered until well after Dalton developed his ideas. Dalton did his work in the early 1800's, the electron was discovered in 1897 and the idea of the proton sorta evolved during the early part of the 1900's

The previous wrong answer of D is related to the concept of isotopes, an idea not developed until the early 1900's by F. Soddy.
the answer is A .
the answer is A

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