Which of the following statements is part of Dalton's atomic theory?

• A. All matter is composed of indivisible atoms.
• B. Electrons orbit the nucleus in fixed paths.
• C. Atoms can be created or destroyed in chemical reactions.
• D. Atoms of the same element can have different masses.

Answer: (A)

Verified step by step guidance

1. Review Dalton's atomic theory, which is a foundational concept in chemistry describing the nature of atoms and matter.
2. Recall that one of Dalton's key postulates is that all matter is composed of indivisible atoms, meaning atoms cannot be broken down into smaller parts by chemical means.
3. Understand that Dalton's theory states atoms of a given element are identical in mass and properties, and atoms of different elements differ in mass and properties.
4. Note that Dalton's theory also states atoms cannot be created or destroyed in chemical reactions, only rearranged.
5. Recognize that the other statements (electrons orbiting the nucleus, atoms having different masses within the same element) are concepts developed after Dalton's time and are not part of his original atomic theory.