The forces holding molecules of iodine together in the solid state are
Correct answer: C. London dispersion forces
- A. covalent bonds
- B. ionic bonds
- C. London dispersion forces
- D. hydrogen bonds
Explanation
Iodine molecules are non polar, so the only attraction available is the temporary induced dipole force, which nonetheless grows large enough in such a heavy molecule to make iodine a solid at room temperature. The strong covalent bond inside each molecule is not broken when the solid sublimes. This distinction between intramolecular and intermolecular forces is the point of the question.
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About Dipole Moment
Dipole moment measures the separation of positive and negative charge in a bond or molecule, with magnitude related to charge and distance, μ = q r. Questions distinguish polar bonds from polar molecules by considering bond direction, molecular geometry and whether individual bond moments cancel through symmetry.
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