Identify the monoatomic molecule from the following options:
Correct Answer: Helium
Subject: chemistry
- Ozone
- Oxygen
- Helium
- Chlorine
Explanation: • <b>Key Fact</b>
Helium exists as a monoatomic molecule (He) because its valence shell is fully satisfied.
• <b>Supporting Detail</b>
Oxygen (O₂) and Chlorine (Cl₂) are diatomic; Ozone (O₃) is triatomic.
• <b>Related Concept</b>
All Group 18 noble gases exist monoatomically in elemental form.
• <b>Why wrong options are wrong</b>
Options A, B, and D require multi-atom bonding to remain stable.
• <b>Exam Trick</b>
Noble gases = Monoatomic.
• <b>Additional Info</b>
Helium has a duplet configuration (1s²).