Question

which of the following is a nonmetal?
○ sulfur
○ sodium
○ lithium
○ aluminum

Explanation:

To determine the nonmetal, we analyze each option: Sodium (Na), lithium (Li), and aluminum (Al) are all metals (alkali metal, alkali metal, and post - transition metal respectively). Sulfur (S) is a nonmetal, as it is in the chalcogen group and does not exhibit metallic properties like luster, malleability, or high electrical conductivity.

Answer:

A. sulfur