2.  Lack properties of metals  17 on PT  Many gases at room temperature  Dull  Brittle  Poor conductors

3. 7. Form compounds 8. Group 18 do not make compounds 9. Diatomic molecules- two identical atoms (O2)

4.  Carbon family- Group 14- 4 valence electrons  Nitrogen family- Group 15- 5 valence electrons  Oxygen family- Group 16- 6 valence electrons  Oxygen can combine with most elements  Halogen Family- Group 17- 7 valence electrons  Noble gases- Group 18- do not gain or loose valence electrons  Hydrogen- simplest element- not grouped

5.  Seven elements some characteristics of metals and nonmetals  Ability to conduct electricity  Semiconductors- some conditions can carry electricity