1. Elements & the Periodic Table Non-Metals & Metalloids Chapter 3 Section 3

2. Non-Metals There are 17 –Each is located to the right of the zigzag line on the periodic table Examples… –Oxygen –Sulfur –Carbon

3. Physical Properties of Non-Metals Dull –Not shiny Poor conductors of… –Heat –Electricity Brittle –Not bendable

4. Diatomic Molecules Molecules with identical non-metals atoms –Oxygen gas O 2 –Nitrogen gas N 2 – Chlorine gas Cl 2 –Hydrogen Gas H 2

5. Carbon Family Group 14 –All have 4 valence electrons Organic –Made of carbon Most molecules that exist

6. Nitrogen Family Group 15 –All have 5 valence electrons Nitrogen –78% of the air you breath –Fertilizer in soil Phosphorous –Matches –Flares

7. The Oxygen Family Group 16 –All have 6 valence electrons O 2 –Oxygen Gas –21% of air O 3 –Ozone –Absorbs UV light S –Sulfur Tires

8. Halogen Family Group 17 –Very reactive –7 valence electrons Fluorine –Tooth strength Chlorine –Salt –Kills microorganisms

9. The Noble Gases Group 18 –Least reactive of all –All have 8 valence electrons Except He has 2 Helium –Balloons Neon, Argon & Xenon –Colorful lights

10. Hydrogen Makes up >90% of the universe… –But <1% of the earth

11. Metalloids 7 elements –On the border between metals & non-metals –Varying ability to conduct electricity Semiconductors –Used in… Computer chips Transistors Lasers