Which term describes elements that are usually dull in appearance, poor conductors of heat and electricity, and can be solids, liquids or gases at room temperature?

• A. Metal
• B. Non metal
• C. Metalloid
• D. Hydrogen

Answer: (B)

Nonmetals are the term that best fits here. They are typically dull in appearance and poor conductors of heat and electricity, unlike metals which are usually shiny and good conductors. Nonmetals also span all three states at room temperature, with examples like carbon (solid), oxygen and nitrogen (gases), and bromine (liquid) illustrating that diversity. Metalloids mix properties of both metals and nonmetals, so they don’t fit the description as cleanly. Hydrogen is a nonmetal, but it’s most notable for being a gas at room temperature, so the overall pattern described is most characteristic of nonmetals.