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@IBchemmilam I dug in. Turns out AsH3 doesn't really form tetrahedral geometry. https://t.co/BrfdLDbnYg "Ammonia adopts sp(3) hybridization (HNH bond angle 108°) whereas the other members of the XH3 series PH3, AsH3, SbH3, and BiH3 instead prefer octahe