III. Section 3 Nonmetals and

Metalloids

A. What is a nonmetal?

1. Lack properties of metals

2. 17 on PT

3. Many gases at room temperature

4. Dull

5. Brittle

6. Poor conductors

7. Form compounds

8. Group 18 do not make compounds

9. Diatomic molecules- two identical atoms (O2)

B. Families of Nonmetals1. Carbon family- Group 14- 4 valence electrons

2. Nitrogen family- Group 15- 5 valence electrons

3. Oxygen family- Group 16- 6 valence electrons

4. Oxygen can combine with most elements

5. Halogen Family- Group 17- 7 valence electrons

6. Noble gases- Group 18- do not gain or loose valence electrons

7. Hydrogen- simplest element- not grouped

C. The Metalloids

1. Seven elements some characteristics of metals and nonmetals

2. Ability to conduct electricity

3. Semiconductors- some conditions can carry electricity