Which of the following is NOT a component of Dalton's Atomic Theory?

• A. A chemical reaction rearranges the grouping of atoms.
• B. Atoms are composed of protons, neutrons, and electrons.
• C. Atoms of a given element are chemically and physically identical.
• D. Atoms of different elements combine in simple, whole number ratios to form compounds.
• E. Matter is composed of atoms that are unable to be divided any further.

Answer: (B)

Verified step by step guidance

1. Begin by reviewing Dalton's Atomic Theory, which was proposed in the early 19th century. It consists of several postulates about the nature of atoms and how they interact.
2. Understand that Dalton's Atomic Theory includes the idea that atoms are indivisible and indestructible particles, which means they cannot be broken down into smaller parts.
3. Recognize that Dalton's theory also states that atoms of a given element are identical in mass and properties, and that atoms of different elements can combine in simple, whole number ratios to form compounds.
4. Identify the statement 'Atoms are composed of protons, neutrons, and electrons' as inconsistent with Dalton's original theory. This is because Dalton's theory did not account for subatomic particles, which were discovered later.
5. Conclude that the statement about atoms being composed of protons, neutrons, and electrons is not a component of Dalton's Atomic Theory, as it reflects a more modern understanding of atomic structure.