Final answer:
The hybridization of the metalloid and the molecular geometry for each of the compounds or ions are provided.
Step-by-step explanation:
Answer a
B is sp³ hybridized; F is also sp³ hybridized so it can accommodate one B-F bond and three lone pairs. The molecular geometry is tetrahedral.
Answer b
Each N atom is sp³ hybridized and uses one sp³ hybrid orbital to form the N-N bond, two to form N-H bonds, and one to accommodate a lone pair. The molecular geometry about each N is trigonal pyramidal.