Why does $\ce{AsH5}$ not exist? Is it because the s-orbital of H doesn't and can't overlap with the d-orbital of As after As makes $\rm sp^{3}d$ hybridization?Theoretically the bond can occur because we can make $\rm sp^3d^2$ hybridization for As to give rise for 5 orbitals with 1 electron each and which can accept the 5 H atoms, but why is this not true in reality?
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8Related: Why do compounds like SF6 and SF4 exist but SH6 and SH4 don't? – Mithoron Jan 15 '16 at 00:07
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4This is definitely not a duplicate question. See especially page 15 of "Ligand Coupling Reactions with Heteroatomic Compounds" https://books.google.com/books?id=gGNvHkXpKkIC&pg=PA15&dq=ash5&hl=en&sa=X&ved=0ahUKEwi72buEiazKAhUBy2MKHcR2D_wQ6AEIHDAA#v=onepage&q=ash5&f=false – DavePhD Jan 15 '16 at 14:59
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@DavePhD You can convert your above comment into an answer. – Nilay Ghosh Jun 09 '21 at 10:38