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Q: Which of the following is not the concept of Dalton's atomic theory?
  • A. Atoms of different elements have different mass and chemical properties.
  • B. Atoms combine in proportion to small integer numbers to form compounds.
  • C. Atoms are invisible particles that cannot be formed or destroyed in a chemical reaction.
  • D. All substances are made up of small particles called molecules.
Correct Answer: Option D - According to Dalton's atomic theory, "every substance consists or made up of small particles called atoms." The atom cannot be divided by any chemical or physical method. Hence option (d) is not the concept of dalton's atomic theory.
D. According to Dalton's atomic theory, "every substance consists or made up of small particles called atoms." The atom cannot be divided by any chemical or physical method. Hence option (d) is not the concept of dalton's atomic theory.

Explanations:

According to Dalton's atomic theory, "every substance consists or made up of small particles called atoms." The atom cannot be divided by any chemical or physical method. Hence option (d) is not the concept of dalton's atomic theory.