The smallest part of an element that still retains the properties of that element is called a(n):

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

Answer: (C)

Verified step by step guidance

1. Understand the question is asking for the smallest part of an element that retains its properties.
2. Recall that a proton is a subatomic particle within an atom, not the smallest part that retains element properties.
3. Recognize that an ion is an atom or molecule with a charge, but it may not be the smallest unit retaining elemental properties.
4. Know that a molecule is a group of atoms bonded together, which can be of different elements or the same element.
5. Conclude that the atom is the smallest unit of an element that retains all the chemical properties of that element.