In introductory chemistry, what is an atom called when it has gained or lost electrons?

• A. Molecule
• B. Isotope
• C. Ion
• D. Neutral atom

Answer: (C)

Verified step by step guidance

1. Understand that an atom consists of protons, neutrons, and electrons. Protons have a positive charge, electrons have a negative charge, and neutrons are neutral.
2. Recognize that a neutral atom has an equal number of protons and electrons, so the overall charge is zero.
3. When an atom gains or loses electrons, the balance between positive and negative charges changes, resulting in a net charge.
4. An atom with a net positive or negative charge due to the loss or gain of electrons is called an ion.
5. Note that a molecule is a group of atoms bonded together, an isotope refers to atoms of the same element with different numbers of neutrons, and a neutral atom has no net charge.