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What is the maximum number of hybrid orbitals and atom can have? It is usually seen that an atom does not have more than 6 hybrid orbitals. Why is it so?

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    $\begingroup$ What about hydrated salts of lanthanides? For example, $\ce{[Eu(H2O)9]^{3+},[ReH9]^{2-}}$ $\endgroup$ – Zenix May 3 at 11:44
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The number 6 relates to a central atom in a molecule with octahedral geometry such as sulfur hexafluoride. $\ce{SF6}$

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(image from wikipedia)

A central atom with 8 other atoms does occur in ionic crystals (body centered cubic), but not in any molecules to my knowledge (memory...).

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(image from website location)

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