Based on their locations on the periodic table, which best compares the properties of the metalloids arsenic (As) and antimony (Sb)?

Arsenic and antimony are in the same group of the periodic table, with arsenic above antimony. Arsenic’s atoms therefore have fewer electron shells. Metallic character increases down a group, so arsenic is less metallic—and more nonmetallic—than antimony. Thus, choice D correctly connects arsenic’s fewer electron shells with its more nonmetallic behavior.

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