The smallest particle of an element that retains the properties of that element is a(n):

• A. atom
• B. molecule
• C. proton
• D. ion

Answer: (A)

Verified step by step guidance

1. Understand the question is asking for the smallest particle of an element that retains the properties of that element.
2. Recall that an atom is the basic unit of an element that maintains its chemical identity and properties.
3. Recognize that a molecule is made of two or more atoms bonded together, so it is not the smallest particle of a single element.
4. Note that a proton is a subatomic particle within an atom and does not retain the properties of the element by itself.
5. Understand that an ion is an atom or molecule with a charge, but it may not always retain the neutral properties of the element.