1. By Liyan Tay, Alan Hu, HaeBin Kim
Metalloids
By Liyan Tay, Alan Hu, HaeBin Kim

2. Hi, I’m
Mr. Metalloid Inbetween,
I’m half metal and half nonmetal.
Hi, I’m the Ms.NonMetal
Hi, I’m the Mr. Metal
Metalloids: an element with both the properties of metals and non metals

3. Electricity/ Heat
Metalloids are characterized by being ‘semi-conductors’
Semi-conductor: a substance that has an electrical conductivity depending on the temperature, exposure to light, or presence of small amount of impurities
Conditions
Electricity/ Heat
Conditions

4. Boron
The Periodic Table
Silicon
Arsenic
Germanium
Astatine
Tellurium

5. Physical Properties
-behave as electrical insulators at room temperature but become electrical conductors (when heated or when small quantities of certain elements are mixed together)
-good conductors of heat and electricity, but not as well as metals
-Malleable
-Solid
-Ductile
-Brittle

6. Chemical Properties

7. Metalloids Chemical Property 1:
Metals
Metalloids
Non Metals
Si (Silicon)
Electron Configuration: 2, 8, 4
O (Oxygen)
Electron Configuration: 2, 6
Fe (Iron) Electron configuration: 2,8,14,2
Chemical Property 1:
have nearly empty outer electron shells of the typical metals and the nearly filled electron shells of the nonmetals.

8. Chemical Property 2:
Have enough empty electron orbital into which electrons can be moved to conduct electric current
B (Boron)
Valence: 3
Si (Silicon)
Valence: 4
Ge (Germanium)
Valence: 4

9. Such as… - Cu (Copper) - Fe (Iron) Chemical Property 3:
Tends to form an alloy with a metal
Such as…
- Cu (Copper)
- Fe (Iron)

10. Interesting Facts
Boron Compounds can kill in a matter of seconds if contacted with bare skin
Silicon is the 7th most abundant element on earth, and second most abundant element in earth’s crust
Tellurium forms many compounds, but none of them are commercially important

11. Interesting Facts
The total amount of astatine in the earth’s crust at any particular time is less than 30 grams
Historians suggest that Napoleon Bonaparte was killed by arsenic poisoning

12. Sources http://www.wwnorton.com/chemistry/concepts/chapter1/ch1_1.htm