Among halogens, iodine is solid at room temperature while Br2 is liquid and CI and F are gases at room temperature, why?
Correct answer: C. Due to stronger London forces
- A. Due to stronger dipole forces
- B. Due to polarity
- C. Due to stronger London forces
- D. Due to stronger Debye forces
Explanation
Option C is correct because as we go down the group the atomic number of the halogens increases so they have more electrons and "greater London forces" of attraction.
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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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