Both Boron (B) and Phosphorus (P) are less electronegative than F.
Since the molecule XF3 has a net dipole moment, we have to find the structure where the dipole moment towards F do not cancel out.
Recall that some molecular shapes are inherently asymmetrical and always lead to polar compounds, as shown below.
The molecule XF3 has a dipole moment. Is X boron or phosphorus?
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