Which of the following best explains why noble gases rarely react with other elements?

• A. They have the highest metallic character in their respective periods.
• B. They possess unpaired electrons that make them inert.
• C. They have low atomic radii, which prevents them from forming bonds.
• D. They have a complete valence electron shell, making them chemically stable.

Answer: (D)

Verified step by step guidance

1. Understand the electronic configuration of noble gases: Noble gases have a full valence shell of electrons, meaning their outermost energy level is completely filled.
2. Recall the concept of chemical stability: Atoms tend to react to achieve a full valence shell, which is a more stable electronic arrangement.
3. Analyze why a complete valence shell leads to low reactivity: Since noble gases already have a full valence shell, they have little tendency to gain, lose, or share electrons, making them chemically inert.
4. Evaluate the incorrect options: For example, noble gases do not have unpaired electrons; in fact, all their electrons are paired, and their atomic radii are not the primary reason for their inertness.
5. Conclude that the best explanation is that noble gases rarely react because they have a complete valence electron shell, which makes them chemically stable and unreactive.