According to most sources, $\ce{CrO3}$ has the following Lewis structure (courtesy ChemSpider):

However, it is also not planar (courtesy Wikipedia):

Implying that there is a lone pair somewhere.

  1. What is the electron configuration of the $\ce{Cr}$ atom?
  2. Which orbital is responsible for the three double bonds?
  3. Where does the lone pair come from?
  4. How would its MO diagram look like?

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