Which of the following represents the oxide ion?

• A. O
• B. O^2–
• C. O₂
• D. O^3–

Answer: (B)

Verified step by step guidance

1. Understand that an oxide ion is a negatively charged ion of oxygen. It typically carries a 2- charge.
2. Recall that the chemical symbol for oxygen is 'O'.
3. Identify that the oxide ion is formed when an oxygen atom gains two electrons, resulting in a charge of 2-.
4. Review the given options: O, O2–, O2, and O3–.
5. Recognize that the correct representation of the oxide ion is O2–, as it indicates an oxygen atom with a 2- charge.