What is the smallest unit of gold that retains the chemical properties of gold?

• A. Molecule
• B. Atom
• C. Electron
• D. Proton

Answer: (B)

Verified step by step guidance

1. Understand the question: The problem is asking for the smallest unit of gold that retains the chemical properties of gold. This means we are looking for the smallest entity that still behaves chemically as gold.
2. Recall the definition of an atom: An atom is the smallest unit of an element that retains the chemical properties of that element. For gold, this would be a single gold atom.
3. Eliminate incorrect options: A molecule is a group of atoms bonded together, but gold is a metallic element and does not naturally form molecules. Electrons and protons are subatomic particles and do not independently exhibit the chemical properties of gold.
4. Conclude that the correct answer is 'atom,' as it is the smallest unit of gold that retains its chemical identity and properties.
5. Remember this concept: For any element, the atom is the fundamental unit that retains the element's chemical properties.