Both
Fluorine has
more electronegative than nitrogen but NH3 has more dipole moment
than NF3. In NH3, Nitrogen is
more electronegative than Hydrogen. So Nitrogen pulls the electrons from Hydrogen
towards itself and so, the direction of moment due to the N-H bonds is in the
same direction as that of the lone pair of electrons on Nitrogen. Hence here
additive effect appears while in case of NF3, Fluorine is more
electronegative than Nitrogen. So fluorine pulls electrons from nitrogen
towards itself so that direction of
moment due to N-F bonds is in the opposite direction as the lone pair of
electron on nitrogen atom. Hence it is clear dipole moment of NH3 is
more than NF3.
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