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MCAT Question A Day - 10/27/14 - Answer!

Which of the following best explains why sulfur can make more bonds than oxygen?

A.  Sulfur is more electronegative than oxygen.
B.  Oxygen is more electronegative than sulfur.
C.  Sulfur has 3d orbitals not available to oxygen.
D.  Sulfur has fewer valence electrons.

C is correct. Because sulfur is larger than oxygen, sulfur has 3d subshells available that allow electrons to form bonds and break the octet rule of the Lewis structure.

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