MCAT Question A Day - 10/29/14

Aluminum has only one oxidation state, while chromium has several. Which of the following is the best explanation for this difference?

A. Electrons in the d orbitals of Cr mayor may not be used to form bonds.

B. Electrons in the p orbitals of Cr mayor may not be used to form bonds.

C. Electrons in the d orbitals of Al may or may not be used to form bonds.

D. Electrons in the p orbitals of AI may or may not be used to form bonds.

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