Question

Why dipolemoment of nf3 is lower than nh3?

Answer 1

Both NF3 and NH3 have a pyramidal shape with a lone pair in Nitrogen but dipole moment of NH3 is higher because -

-Electronegativity of F is higher than H

-Thus the direction of NF3 vector bond is towards F

-Whereas, in NH3, it is towards N which leads to a higher dipole moment.