geometry applies to all trihalides.On this basis the valence-shell electronic configuration of lighter Group 5B trihalidescan be written as la12, ley4 2a12, 2e4, 3a12, 3e4, 4e4, 1aZ2,4UlZ.'*3+ Non-S.1. unit employed: eV x 1.60 x lo-'' J.For the bismuth trihalides the lal...