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I am currently studying about the vespr theory and I'm stuck on an ion which is dichromate (VI) ion $\ce{Cr2O7^2-}$. So this is what I am thinking about:

1) If I make the oxygen atom at the middle the centre atom, it is a bent.
2) If I make the chromium atom thecentre atom, it is a tetrahedral.

So, my problem is that whether dichromate (VI) ion bent or tetrahedral?

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    $\begingroup$ Well, the overall shape of the molecule doesn't get anything close to bent and/or tetrahedral. I suggest doing some readings about hybridization and MO basics, rather than sticking to most-beloved, most-loathed VSEPR. $\endgroup$ – M.A.R. Apr 25 '15 at 13:15
  • $\begingroup$ I am going to start reading about hybridization after Vespr $\endgroup$ – Simon-Nail-It Apr 25 '15 at 13:23
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    $\begingroup$ @MARamezani The VSEPR model should be digested in a very careful way - it predicts some molecular shapes correctly for the entirely wrong reasons. And for those reasons it is also often very wrong. $\endgroup$ – Martin - マーチン Apr 25 '15 at 17:38
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Both, Bent about Oxygen and tetrahedral about chromium:

$\hskip2.5in$enter image description here

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  • $\begingroup$ So, how do I call it? Tetrahedral bent? $\endgroup$ – Simon-Nail-It Apr 25 '15 at 13:01
  • $\begingroup$ @Simon-Nail-It nothing nothing I suppose $\endgroup$ – RE60K Apr 25 '15 at 13:03

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