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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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