Which one among the following is NOT a postulate of John Dalton's Atomic Theory (1808)?

Correct Answer: Atoms contain a dense, positively charged nucleus surrounded by electrons.

Subject: chemistry

• All matter is made of indivisible atoms.
• Atoms of different elements have different mass and chemical properties.
• Atoms contain a dense, positively charged nucleus surrounded by electrons.
• Atoms can neither be created nor destroyed in a chemical reaction.

Explanation: • <b>Key Fact</b> The concept of "nucleus" and "electrons" was unknown to Dalton. Rutherford discovered nucleus in 1911; Thomson discovered electron in 1898. • <b>Supporting Detail</b> Dalton claimed that the atom was the ultimate, indivisible particle of matter. • <b>Related Concept</b> Postulates A, B, and D are authentic statements from Dalton's original 1808 theory. • <b>Why wrong options are wrong</b> Option C belongs to Rutherford's model, not Dalton's. • <b>Exam Trick</b> If a statement mentions subatomic particles (protons, electrons, nucleus), Dalton did NOT say it! • <b>Additional Info</b> Dalton's theory failed to explain Isotopes.

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