What is the hybridization in SbH3 and PH3?

In SbH3 (stibine), the hybridization of the antimony (Sb) atom is sp³, as it forms four equivalent bonds with hydrogen atoms, resulting from the mixing of one s orbital and three p orbitals. Similarly, in PH3 (phosphine), the phosphorus (P) atom also exhibits sp³ hybridization for the same reason, forming three P-H bonds and having a lone pair of electrons. Both compounds have a trigonal pyramidal molecular geometry due to the presence of the lone pair.