Well, I think $\ce{CaI2}$ is the same as $\ce{BeH2}$ and $\ce{AlCl3}$ the same as $\ce{NH3}$, but I'm not sure since $\ce{I}$ and $\ce{Cl}$ have their own pair electrons and I don't know if this affects the structure...

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    $\begingroup$ Central atoms/cations are affecting geometry stronger than atoms they are connected with. $\endgroup$
    – Mithoron
    Jan 28 '15 at 14:53

$\ce{CaI2}$ is mostly ionic in the solid and aqueous phases. In the gas phases it is a linear molecule. See Ionic or covalent? Can some first hints be derived from the solid state structures of alkaline earth metal halide adducts?

$\ce{AlCl3}$ has an octaheral structure in the solid phase.

In the liquid phase:

enter image description here

Trigonal planar monomers also exist at high temperature.

Source: http://en.wikipedia.org/wiki/Aluminium_chloride


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