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Properties of Matter Element Card 17, Lesson 21

Silicon

Si

Melting point

1410° C

Boiling point

2355° C

Density

2.3 g/cm³

Appearance

There are two forms of silicon: crystalline and a brown form.

Other physical properties

 

Chemical properties

Silicon is reactive only at high temperatures.

Compounds

Silicon is contained in many minerals. Silicon dioxide is a major component of sand.

Uses

In its crystalline form, silicon is used in computer chips. Silicon compounds are used in glass and silicones, some of which behave like plastics.

Notes

Silicon is the second most abundant element in Earth's crust. Most of it is combined with oxygen to form silicon dioxide.


More information on silicon:

http://www.newton.dep.anl.gov/newton/askasci/1993
/chem/CHEM015.HTM

 

A large sand dune in Death Valley national park

Silicon, combined with oxygen, forms silicon dioxide, which is a major component of sand.


A silicon chip up close

Silicon is used to make chips for computers.

 

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