Which of the following is a noble gas least likely to do?

• A. Have a complete valence electron shell
• B. Exist as a monatomic gas at room temperature
• C. Exhibit low chemical reactivity
• D. Form chemical bonds with other elements

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the properties of noble gases. Noble gases are elements in Group 18 of the periodic table and are known for having a complete valence electron shell, which makes them very stable.
2. Step 2: Recognize that because noble gases have a complete valence shell, they typically exist as monatomic gases at room temperature, meaning they are single atoms rather than molecules.
3. Step 3: Note that noble gases exhibit low chemical reactivity due to their stable electron configuration, which means they rarely participate in chemical reactions.
4. Step 4: Analyze the options given: having a complete valence shell, existing as monatomic gases, and exhibiting low reactivity are all characteristic behaviors of noble gases.
5. Step 5: Conclude that the least likely behavior for a noble gas is to form chemical bonds with other elements, since their full valence shells make them very reluctant to share or transfer electrons.