General Chemistry: Principles and Modern Applications (10th Edition)

Published by Pearson Prentice Hal
ISBN 10: 0132064529
ISBN 13: 978-0-13206-452-1

Chapter 23 - The Transition Elements - 23-4 Concept Assessment - Page 1052: 23-4


The backbone $\mathrm{Cr}-\mathrm{O}-\mathrm{Cr}-\mathrm{O}-\mathrm{Cr} $ is surrounded by three tetrahedral structures in the $\left[\mathrm{Cr}_{3} \mathrm{O}_{10}\right]^{2-}$ anion.The central $\mathrm{Cr}$ atom of the backbone is bonded to two additional $\mathrm{O}$ atoms and the $\mathrm{Cr}$ atoms at the ends to three other $\mathrm{O}$ atoms. The overall number of $\mathrm{O}$ atoms= 10. The oxidation state of Cr is +6 while that of $\mathrm{O}$ is -2, which is responsible for the -2 charge on the anion.

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