The formal charge is the difference between the number of valence electrons in an isolated (i.e. free) atoms and the number of electrons assigned to that atom in a Lewis structure.
For a molecule the net dipole moment is the vector addition of bond moment adn lone pair moment.
Which of the following species has zero dipole moment ?

Options

A. `BF_(3)`
B. `NH_(4)^(+)`
C. `NF_(3)`
D. both (A) and (B)

Answer

D

Explanation