Canadian Medical Guide > Chemicals and Drugs > Inorganic Chemicals > Elements > Trace Elements > Silicon Terms and Definitions

Silicon

Medical Definition:	Silicon. A trace element that constitutes about 27.6% of the earth's crust in the form of SILICON DIOXIDE. It does not occur free in nature. Silicon has the atomic symbol Si, atomic number 14, and atomic weight 28.09.
Guide Notes:	a trace element; Si-28; do not confuse with SILICA or SILICONES; TN 172: differentiation among silic- terms; Si-29, 30 = SILICON (IM) + ISOTOPES (NIM); Si-26, 27, 31, 32 = SILICON (IM) + RADIOISOTOPES (IM); lung dis from various silicon dusts = SILICOSIS
CAS Type 1 Name:	CAS Number:	7440-21-3

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