title: Chromium oxide
text: # Chromium oxide
  
  Chromium oxide may refer to:
  
  * Chromium(II) oxide, CrO
  * Chromium(III) oxide, $Cr_2O_3$
  * Chromium dioxide (chromium(IV) oxide), $CrO_2,$ which includes the hypothetical compound chromium(II) chromate
  * Chromium trioxide (chromium(VI) oxide), $CrO_3$
  * Chromium(VI) oxide peroxide, $CrO_5$
  * Mixed valence species, such as $Cr_8O_{21}$
  