In a common allotrope of elemental crystalline arsenic, each arsenic atom forms covalent bonds to three other atoms in a puckered sheet such that the molecular geometry around each atom of arsenic is trigonal pyramidal. Which of the following is most likely the reason for this? Select the correct answer below: A. Each arsenic atom is sp2-hybridized. B. Arsenic has an unoccupied d-orbital. C. There is a single lone pair of electrons in arsenic's valence shell. D. There are two lone pairs of electrons in arsenic's valence shell.

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Q: 27

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