Answer:
Explanation:
Bond angles in BH3 are greater than the bond angles for NH3 because BH3 have three electron clouds that bond to one central atom Boron. Each clods have electrons that bond between Boron and Hydrogen atom. The three electrons cloud attach to Central atom B and adopt a position which make them to form triagonal planar geometry making the angles between them to be bigger.
But as for NH3, it has extra lone pairs making it four electron clouds which form tetrahedral geometry. The extra lone pair occupy space making the angles between the bond to be reduced.
