Chemistry: A Molecular Approach (3rd Edition)

Electron geometry: tetrahedral Molecular geometry: trigonal pyramidal Idealized bond angle: $109.5^{\circ}$ Deviation from idealized bond angle : yes
$NF_3$ has 3 covalent bonds and one lone pair of the N atom. Its electron geometry is tetrahedral. Its molecular geometry is trigonal pyramidal since N atom is bonded to 3 F atoms. Its idealized bond angle is that of the tetrahedral geometry, $109.5^{\circ}$. But the presence of the lone pair causes deviation from the idealized bond angle.