MOLECULAR POLARITYFIELD NOTE 174 / 175

Is XeF2 polar or nonpolar?

XeF2 is nonpolar because two equal Xe–F bonds point in opposite directions along a straight line.

THE ANSWERNonpolar.

Xenon Difluoride · linear

FIGURE 01

The molecule in space

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STRUCTURE / 01
Xe ×1F ×2
XeFF
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01 / MODEL RECORDIllustrative geometry. Atom sizes and bond thickness are illustrative.How model data is used ↗

THE REASONING

Why XeF2 is nonpolar

Xenon has two bonding regions and three lone pairs in the conventional VSEPR picture. The lone pairs occupy equatorial positions, leaving the two fluorines opposite each other and their equal bond dipoles canceled.

A USEFUL DISTINCTION

What to notice

XeF2 is linear despite five electron regions around Xe. The electron-pair geometry is trigonal bipyramidal, but the two visible bonded atoms form a line.

QUICK REFERENCE

Common questions about XeF2

  1. 01
    What does the Lewis structure of XeF2 show?

    Xe makes two Xe–F single bonds and keeps three lone pairs. Each fluorine has three lone pairs.

  2. 02
    What is the molecular geometry of XeF2?

    XeF2 has a linear molecular geometry. The 3D model shows representative bond angles of 180°. These are angles in the illustrative model, not experimental measurements.

  3. 03
    What is the molar mass of XeF2?

    XeF2 has an approximate molar mass of 169.29 g/mol, calculated from its formula using abridged standard atomic weights. Natural isotope variation can change the last digits.

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