What is the shape (molecule geometry) of boron trihydride (BH₃)

The molecular geometry of boron trihydride (BH₃) is trigonal planar. Here's a step-by-step explanation:

1. Identify the central atom: In BH₃, boron (B) is the central atom.

2. Count the total number of atoms connected to the central atom: There are three hydrogen (H) atoms connected to the central boron atom.

3. Count the number of lone pairs on the central atom: Boron does not have any lone pairs in this molecule.

4. Use the VSEPR theory to determine the shape: According to the VSEPR theory, a molecule with three atoms attached to the central atom and no lone pairs will have a trigonal planar shape.

So, the shape of boron trihydride (BH₃) is trigonal planar.