Determine the partial negative charge on the fluorine atom in a C−F bond. The bond length is 1.39 Å and the bond dipole moment is 1.60 D .?

By definition, 1 D = 3.34 × 10⁻³⁰ C m

Partial charge on F atom : -Q
Partial charge on C atom : +Q
Distance between +Q and -Q, r = 1.39 Å = 1.39 × 10⁻¹⁰ m

Dipole moment :
Q r = 1.60 D
Q × (1.39 × 10⁻¹⁰ m) = (1.60 D) × (3.34 × 10⁻³⁰ C m/D)
Q = 1.60 × (3.34 × 10⁻³⁰) / (1.39 × 10⁻¹⁰) C
Q = 3.84 × 10⁻²⁰ C

The negative charge on the F atom = - 3.84 × 10⁻²⁰ C