what is the vsepr geometry of the particle?

Brief Explanations:

The VSEPR theory predicts molecular shapes based on electron - pair repulsion. In (AsH_3), arsenic ((As)) has 5 valence electrons. It forms 3 single bonds with hydrogen ((H)) atoms (using 3 valence electrons), and there is 1 lone pair of electrons remaining on (As). The electron - pair geometry is tetrahedral (3 bonding pairs + 1 lone pair). But the molecular geometry (VSEPR geometry considering only the positions of atoms) for a molecule with (AX_3E) (where (A) is the central atom, (X) is the surrounding atom, and (E) is the lone pair) is trigonal pyramidal.

Answer:

trigonal pyramidal