1. Metalloids
By: Nola Goss

2. Properties of Metalloids
They are solids
They are shiny and brittle
They have relatively good electrical conductivity
They are in groups 13, 14, 15, and 16

3. Boron Symbol: B Atomic #: 5 Atomic Mass: 10.811 amu Protons: 5
Electrons: 5
Neutrons:6
Valance Electrons:13
Melting Point: degrees C
Boiling Point: degrees C
Density:2.34 g/cm3
Color: Brownish
Crystal Structure: Rhombohedral

4. Discovered in 1808
Discovered by Pierre and Marie Curie
Name origin is from Poland
There are no known uses
It was obtained by pitchblende, and decay of radium
The reactivity of it depends on its form

5. Silicon Symbol: Si Atomic #:14 Atomic Mass:28.0855 amu Protons:14
Electrons:14
Neutrons:14
Valance Electrons:14
Melting Point: degrees C
Boiling Point: degrees C
Density: g/cm3
Color: Grey
Crystal Structure: Cubic
Silicon

6. Discovered in 1823
Discovered by Jon Berzelius
Name origin is Latin
Its uses are glass and semiconductors
It is found in clay, granite, quartz, and sand
It is the second most plentiful element
If silicon is pure it is too reactive to be found in nature

7. Germanium Symbol: Ge Atomic #:32 Atomic Mass:72.61 amu Protons:32
Electrons:32
Neutrons:41
Valance Electrons:14
Melting Point:937.4 degrees C
Boiling Point:2830.0degrees C
Density:5.323 g/c3
Color: Grayish
Crystal Structure: Grayish

8. Discovered in 1886
Discovered by Clemens Winkler
Name origin is Latin
It is use is semiconductors
Obtained by refining of copper, zinc, and lead
It is more reactive than silicon

9. Arsenic Symbol: As Atomic #: 33 Atomic Mass: 74.9216 Protons:33
Electrons:33
Neutrons:42
Valance Electrons:15
Melting Point:817.0 degrees C
Boiling Point:613.) degrees c
Density:5.72 g/cm3
Color: Gray
Crystal Structure: Rhombohedral

10. Discovered since the time of the ancients
Its unknown who discovered it
Name origin is Greek
It is used for poison, conducting electricity, and semiconductors
Obtained from mispickel
It is for the most part stable

11. Antimony Symbol: Sb Atomic #:51 Atomic Mass: 121.76 amu Protons:51
Electrons:51
Neutrons:71
Valance Electrons:15
Melting Point:630.0 degrees C
Boiling Point: degrees c
Density:6.684g/cm3
Color: Bluish
Crystal Structure: Rhomohedrial

12. Discovered since the ancients The discoverer is unknown Name origin is Greek It is used for hardening lead, plastics, and chemicals It is obtained from stibnite and valentinite It is reactive with most substances

13. Tellurium Symbol: Te Atomic #: 52 Atomic Mass: 127.6 amu Protons: 52
Electrons: 52
Neutrons:76
Valance Electrons: 16
Melting Point: degrees C
Boiling Point: degrees C
Density: 6.24g/cm3
Color: Silverish
Crystal Structure: Hexagonal
Tellurium

14. It was discovered in 1782
It was discovered Franz Muller von Reichenstien
Name Origin is Greek
It is used for coloring glass and ceramics, and in thermoelectric devices
It is obtained from the by-product of refining lead and copper
It is unreactive

15. Polonium Symbol: Po Atomic #:84 Atomic Mass: 209.0 amu Protons:84
Electrons:84
Neutrons:125
Valance Electrons: 16
Melting Point:254.0 degrees C
Boiling Point: degrees C
Density: 9.4 g/cm3
Color: Unknown
Crystal Structure: Monoclinic

16. It was discovered in 1898
It was discovered by Pierre and Marie Curie
Name Origin is Polish
It has no known uses
It is obtained from pitchblende and decay of radium

17. References http://www.infoplease.com/encyclopedia /science/boron.html
dia/8430/valentinite
14/index.wt.html
ts/b.html
04/03/marie-curie-a-determined-scientist/
ts/si.html
ts/ge.html
84/index.html
ts/as.html
ts/sb.html
marie-curie
ts/te.html
s-jacob-berzelius-one-of-founders- of_20.html
ts/po.html
/chemistry.html
time-tales-of-dark-mines-and-digging-for- treasure/historical-figures/clemens- winkler/ on
France/M/Mispickel-Plumelin-56-1
m/chemistry.html
stone.com/2015/08/stibnite-mineral.html
ements/arsenic/