Polarity of Fluorine?

Which is the correct description of polarity in F2 and HF molecules?

A. Both molecules contain a polar bond.

B. Neither molecule contains a polar bond.

C. Both molecules are polar.

D. Only one of the molecules is polar.

2 Answers

  • 6 months ago
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    Polarity ....

    Molecular fluorine, F2, is nonpolar, the net dipole moment is zero. Molecular HF (a gas) is polar. The electronegativity difference is 1.78. There is a significant dipole moment.

    It is important to understand that a molecule can be nonpolar, even if the bonds are polar. The net dipole moment is the vector sum of the individual bond dipole moments, and it is possible for the bond dipole moments to "cancel out" leaving a net dipole moment of zero (nonpolar).

    Such is the case with carbon dioxide, a linear molecule, O=C=O. Each C=O bonds is polar, but the vector sum is zero, hence it is nonpolar.

    ..← → ............. these two dipole moments cancel



    ↑ /...\ ↑ ....... the two bond vectors, resolved in to perpendicular components


    .→ ←

    The "vertical" components add, while the "horizontal" components cancel. This leaves a net dipole moment on water pointing from the center of the hydrogen atoms through oxygen

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  • 6 months ago

    D. Only one of the molecules (HF) is polar.

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