Final answer:
A nonmetal is a chemical element that lacks metallic properties. It can exist as a solid, liquid, or gas and is a poor conductor of heat and electricity. Examples include oxygen, nitrogen, carbon, and sulfur.
Step-by-step explanation:
A nonmetal is a chemical element that does not exhibit metallic properties. It typically lacks metallic luster, is a poor conductor of heat and electricity, and is brittle when solid. Nonmetals can exist as solids, liquids, or gases at room temperature. Examples of nonmetals include oxygen, nitrogen, carbon, and sulfur.
Learn more about Properties of nonmetals