1. Metals, Non-metals and Metalloids

2. Properties of Metals They are usually shiny
They are good conductors of electricity which is called conductivity
They are solid at room temperature (except mercury which is liquid)
Most are malleable (can be hammered into different shapes)
Most are ductile (can be pulled into a long, thin wire)
Most react with acids
Examples: Gold (Au), Silver (Ag), Potassium (K), Tin (Sn), Lead (Pb)

3. Metal Mixtures
Most metal object are mixtures of metallic elements from the periodic table
Example: Stainless steel
Is a mixture of mostly iron (Fe), nickel (Ni), and chromium (Cr)
A metal produced by blending different metal elements together is called an alloy
Example: Brass is an alloy of copper (Cu) and zinc (Zn)

4. Uses of metals Jewellery – such as gold and silver
Art – artists use different metals to create glass different colours
Aluminum foil
Copper is used for electrical wiring

5. Properties of Non-Metals
Many are gases at room temperature (a few are solid and one is a liquid)
Solid non-metals do not have a shine – most are have a dull lustre
Solid non-metals are brittle which means they break or shatter when bent or struck
Are poor conductors of electricity
Examples: Carbon (C), Sulfur (S), Oxygen (O), Chlorine (Cl), Iodine (I), Neon (Ne).

6. Non metal Elements in Air
Composition of air is:
78% nitrogen
21% oxygen
0.9% argon
And 0.1% neon, helium, krypton and compounds of water and carbon dioxide

7. Uses of non-metals
Chlorine is used to disinfect water for drinking or swimming
Bromine is used in dyes, medicines, pesticides and photography
Helium balloons rise because helium is less dense than air
Xenon used in bluish headlights of certain vehicles
Neon and argon give off brightly coloured lights

8. Properties of Metalloids
Have properties in between those of metals and non- metals
All metalloids are solid at room temperature
Some metalloids are weak conductors of electricity
Examples: Boron (B), Silicon (Si), Germanium (Ge), arsenic (As)

9. Classwork AIM 10 AIM 11 Reminder:
Computer Lab time to work on Element Project
Friday March 8th
Room 203