1. By what properties are metals distinguished from nonmetals? d. High conductivity for heat and electricity.
2. What common metals are produced in great quantities? a. Iron, copper and zinc.
3. What metals are called light? e. Aluminium, berillium and titanium.
4. What properties do nonmetals have?b. They are usually poor conductors of heat and electricity.
5. What is done to protect metals from corrosion? c. They are coated by some organic coatings.