Posted by Jen on Wednesday, September 30, 2009 at 6:38pm.
The six orbitals on the central atom, As, are sp^3d^2 hybrids. That is the kind of hybridization you have in an octahedral structure, "XY6". Each of the hybrid orbitals on the As atom is forming a sigma bond with the half filled p orbital on an F atom.
As is [Ar]3d10 4s2 4p3.
F is [He] 2s2 2p5
So As has 5 electrons
F has 7 and 7x6 = 42
Add 1 electron for the negative charge on the ion 1
42+5+1 = 48.
So this has 6 regions of high electron density (from the 6 F atoms), probably this is d2sp3 hybridization and octahedral structure.
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