Answer:
1. Elements
Substances with only one type of atom.
2. Metal
An element that is malleable, polishes to a luster, conducts heat and electricity well, and tends to lose electrons in a chemical reaction.
3. Metalloid
An element with properties of both metals and nonmetals.
4. Nonmetal
An element that is brittle, insulates heat and electricity well, and tends to gain electrons in a chemical reaction.
