Iodine is solid due to_________________?
Correct answer: C. High polarizability
- A. Strong covalent bond
- B. Large value of dipole moment
- C. High polarizability
- D. Strong hydrogen bonding
Explanation
Iodine exists as non-polar I2 molecules, but its large electron cloud is easily distorted, producing strong London dispersion forces that hold the solid together. Students often choose a, strong covalent bond, by confusing the covalent bond within each I2 molecule with the weaker intermolecular forces between iodine molecules.
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About Ionic and Molecular Crystals
Ionic crystals contain oppositely charged ions held by electrostatic forces, whereas molecular crystals contain discrete molecules joined by weaker intermolecular forces. Their structures explain differences in melting point, hardness, volatility, solubility and electrical conductivity, especially between solid and molten states.
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