What provides the smallest unit of a chemical element?

What provides the smallest unit of a chemical element?

• A. Molecule
• B. Ion
• C. Atom
• D. Nucleus

Answer: (C)

The key idea is that the atom is the smallest unit that defines a chemical element. An atom carries the identity of that element—the number of protons in the nucleus determines which element it is, and the arrangement of electrons around the nucleus governs its chemical behavior. A molecule, on the other hand, is a group of two or more atoms bonded together, so it’s not the basic unit that defines the element itself. An ion is simply a charged atom, still an atom, just with a different number of electrons. The nucleus is the central core of the atom, but chemical properties arise from the electrons surrounding it, not from the nucleus alone. So the smallest unit of a chemical element is the atom.

The key idea is that the atom is the smallest unit that defines a chemical element. An atom carries the identity of that element—the number of protons in the nucleus determines which element it is, and the arrangement of electrons around the nucleus governs its chemical behavior. A molecule, on the other hand, is a group of two or more atoms bonded together, so it’s not the basic unit that defines the element itself. An ion is simply a charged atom, still an atom, just with a different number of electrons. The nucleus is the central core of the atom, but chemical properties arise from the electrons surrounding it, not from the nucleus alone. So the smallest unit of a chemical element is the atom.