The decreasing order of bond angles in BF3, NH3, PF3 and is :
As we learned
S - P Hybridisation -
When one S - and one P - orbital belonging to the same main shell of an atom are mixed together to form two new SP - orbitals.
Diagonal or Linear
sp2 Hybridisation -
When one s - and two p - orbitals of the same shell of an atom mix to form three new equivalent orbitals.The hybridised orbital is called sp2 orbital.
Shape is Trigonal planar
sp3 hybridisation -
when one s - and three p - orbital belonging to the same shell of an atom mix together to form four new equivalent orbitals is called sp3 orbital.
when size of central atom increases bond angle decreases
B.A of NH3 > PH3
PF3 < NH3 < BF3 <