Metalloids 101

Boron Silicon Germanium Arsenic Antimony Tellurium Polonium

History

Boron-

Date of Discovery: 1808

Discoverer: Sir Humphry Davy, J.L Gay-Lussac

Obtained From: kernite


Silicon-

Date of Discovery: 1823

Discoverer: Jons Berzelius

Obtained From: Second most abundant element. Found in clay, granite, quartz, sand


Germinium-

Date of Discovery: 1886

Discoverer: Clemens Winkler

Obtained From: refining of copper, zinc, lead


Arsenic-

Date of Discovery: 1250 AD

Discoverer: Albertus Magnus

Obtained From: mispickel


Antimony-

Date of Discovery: 23-79 AD

Discoverer: Abu Musa Jabir Ibn

Obtained From: stibnite, valentinite


Tellurium-

Date of Discovery: 1782

Discoverer: Franz Muller von Reichenstein

Obtained From: by-product of refining of lead and copper


Polonium-

Date of Discovery: 1898

Discoverer: Pierre and Marie Curie

Obtained From: pitchblende, decay of radium

Melting and Boiling Points

Boron:

Melting Point 2,300 C

Boiling Point 2,550 C


Silicon:

Melting Point 1,410 C

Boiling Point 2,355 C


Germanium:

Melting Point 937.4 C

Boiling Point 2,830 C


Arsenic:

Melting Point 817 C

Boiling Point 613 C


Antimony:

Melting Point 630 C

Boiling Point 1,750 C


Tellurium:

Melting Point 449.5 C

Boiling Point 989.8 C


Polonium:

Melting Point 254 C

Boiling Point 962 C

Our Elements

FUN FACTS

1. Over 27% of silicon is in the Earth's crust.

2. Antimony was used as cosmetics by the ancient Egyptians.

3. Tellurium gets its name from the Latin word "tellus" which means "earth."

4. Arsenic is known to be one of the most poisonous elements.

5. Polonium is used in nuclear reactors.

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Environmental and Safety Concerns

Polonium is a radioactive material that is harmful to humans and other living creatures. In human it can cause cancer and it can devastate a whole ecosystem. The main cause for the problem is by improper mining. It can be solved by using proper radioactive mining instructions and safe transportation.



Antimony is also harmful when you inhale it in dust form. It is usually found in emissions from chemical plants but also can be found in tiles and metal pipes. It is harmful when it is in contact with skin, when you inhale it, and when you digest it.


Arsenic is a highly poisonous element that is used for extermination of pests. But it could be found in ground water. Thousands of people get arsenic poisoning every year from drinking well water. A way to prevent this is to not use fertilizers and don't litter.

JOKES

I don't like Metalloids, they are too boron.

-Jacob


Does anyone know a joke about sodium? Na.

-Mahesh


Bob: You want to hear a potassium joke?

Tom: NO!

Bob: K.

- Jacob

Uses for Group

Boron is used in heat resistant alloys. For example, it is combined with nickel to make a super heat resistant metal.

Silicon is used in glass and semiconductors. It is almost exclusively used to make computer chips.

Antimony is used in chemicals and plastics. You will probably find them in chemical factories and in regular, plastic shopping bags.


Placement in Periodic Table

Group's position is through periods 2-6 and groups 13-16. It is between the non-metals, other metals, and halogens. It is organized like this because of atomic number and its properties like semi-conductivity. All elements are pretty stable except for the radioactive Polonium and none will react to anything.


Citations:

Images:

Google Images- http://www.google.com/imghp

Information:

Google- www.google.com

Wikipedia- http://www.wikipedia.org/

Chemical Elements- http://www.chemicalelements.com/groups/metalloids.html

Ptable-http://ptable.com/

Smore:

Smore- www.smore.com