Which of the following statements is NOT part of Dalton's atomic theory?

• A. Atoms of different elements combine in simple whole-number ratios to form compounds.
• B. Atoms of the same element are identical in mass and properties.
• C. Atoms can be divided into protons, neutrons, and electrons.
• D. Atoms cannot be created or destroyed in chemical reactions.

Answer: (C)

Verified step by step guidance

1. Step 1: Understand Dalton's atomic theory, which was proposed in the early 19th century and laid the foundation for modern atomic theory.
2. Step 2: Recall the main postulates of Dalton's atomic theory: (a) All matter is made of indivisible atoms, (b) Atoms of the same element are identical in mass and properties, (c) Atoms of different elements combine in simple whole-number ratios to form compounds, and (d) Atoms cannot be created or destroyed in chemical reactions.
3. Step 3: Identify that Dalton's theory treats atoms as indivisible particles, meaning it does not include the concept of subatomic particles like protons, neutrons, and electrons.
4. Step 4: Compare each statement given in the problem to Dalton's postulates to determine which one contradicts his theory.
5. Step 5: Conclude that the statement 'Atoms can be divided into protons, neutrons, and electrons' is NOT part of Dalton's atomic theory because the discovery of subatomic particles came after Dalton's time.