Which of the following is NOT a type of chemical bond?

• A. Hydrogen bond
• B. Ionic bond
• C. Gravitational bond
• D. Covalent bond

Answer: (C)

Verified step by step guidance

1. Step 1: Understand what a chemical bond is. A chemical bond is an interaction that holds atoms together in molecules or compounds, typically involving the sharing or transfer of electrons.
2. Step 2: Review the types of chemical bonds listed: Ionic bonds involve the transfer of electrons between atoms, covalent bonds involve the sharing of electrons, and hydrogen bonds are a type of intermolecular attraction involving hydrogen and electronegative atoms.
3. Step 3: Recognize that 'gravitational bond' is not a chemical bond. Gravity is a physical force acting between masses, not an interaction involving electrons or atoms in chemistry.
4. Step 4: Conclude that among the options, 'gravitational bond' is NOT a type of chemical bond because it does not involve atomic or molecular interactions.
5. Step 5: Remember that chemical bonds are defined by electronic interactions, so any term referring to forces like gravity does not qualify as a chemical bond.