Polar molecules

[Michelle Nwufo 2G]

Can someone explain to me why NF3 is a polar molecule? Is it because the lone pair on the central atom distorts the shape of what would have been a tetrahedral, making the molecule asymmetrical?

[Kyleigh Follis 2H]

Not sure if you mean NF3, but if so it is because the dipoles do not cancel each other due to the lone pair giving the shape of trigonal pyramidal. So, the N-F polar bonds make the whole molecule polar.

[Mona Lee 4L]

If there is a lone pair, there will likely be a net dipole pointing in the opposite direction. In general, if a molecule has lone pairs, it is likely to be polar.

[Louise Zhuang]

Your explanation is basically right. The lone pair also has a strong negative charge, and there's nothing at the opposite side to cancel it out, making the molecule polar.

[Dina Geotas 4A]

NF4 would be polar due to the lone pair of electrons around the central atom, N.

[KatrinaPho_2I]

Yes, your explanation is perfect for why this molecule is polar :)