John Dalton's Atomic Theory laid the conceptual foundation for modern chemistry, yet several of its — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

Postulate (A) is inaccurate because the discovery of subatomic particles (protons, neutrons, electrons) and nuclear reactions proved that atoms are internally complex and divisible. Postulate (B) is inaccurate because the discovery of isotopes proved that atoms of the *same* element can have completely different atomic masses (e.g., C-12, C-13, C-14). Postulates (C) and (D) largely hold true for standard chemical combinations and classical stoichiometry (the Law of Definite Proportions and Conservation of Mass).