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Fluorine and iodine are members of the halogen family, but their physical properties are different, as shown in the table below.

Element Melting Point (ºC) Boiling Point (ºC)
Fluorine –220 –188
Iodine +118 +184

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Which of the following is the BEST explanation for these differences in melting and boiling point?


Fluorine has a higher value for electronegativity than iodine.


The covalent bond in the fluorine molecule is stronger than the covalent bond in the iodine molecule.


Iodine molecules are larger and more polarizable than fluorine molecules.


Fluorine is a nonpolar molecule, but iodine is a polar molecule.

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