Si

SILICON

Definition From "Silex" or flint. Second most common element, after oxygen. It constitutes about one fourth of the earth's crust. nearly 40% of all common minerals and 90% of ingeneous rock forming minerals contains silicon.

Discovery 1823 by Jons Jakob Berzelius of Sweden

Uses Transistors, Rectifiers, Lubricants

Group of Elements Metalloids/Semin-metals(Solid)

Atomic Weight 28.084; 28.086

Oxidation State 2, +-4

Melting Point 1410

Boiling Point 2355

Density 2.24 g/cm3

Electronegativity 1.8