Multiple choice

Which of Dalton’s postulates required revision?

  1. Atoms are indivisible.

  2. Atoms combine in whole number ratios.

  3. Atoms of one element differ from atoms of another element.

  4. Atoms can be combined, separated, or rearranged.
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A Correct answer
Explanation

Dalton's postulate that atoms are indivisible had to be revised after the discovery of subatomic particles (electrons, protons, and neutrons), which showed that atoms are indeed divisible into smaller components.

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