2
$\begingroup$

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...

$\endgroup$
1
  • 1
    $\begingroup$ Central atoms/cations are affecting geometry stronger than atoms they are connected with. $\endgroup$
    – Mithoron
    Jan 28 '15 at 14:53
1
$\begingroup$

$\ce{CaI2}$ 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

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.