Dalton's atomic theory — task. Chemistry CBSE Live product, Class 9 (2025-26).

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A new set of atoms is discovered that have different atomic numbers but the same mass number. Which of Dalton’s postulates does this challenge most directly?

Atoms cannot be subdivided, created, or destroyed
Atoms of the same element are identical in mass and properties
Atoms of different elements have different masses
Atoms combine in simple whole-number ratios to form compounds

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2. Dalton's atomic theory

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