silicon
482
s
silicides are structurally similar to
the interstitial carbides but the range
encountered is more diverse. They
react with mineral acids to form a
range of *silanes.
silicon Symbol Si. A metalloid element belonging to *group 14 (formerly IVB) of the periodic table; a.n.
14; r.a.m. 28.086; r.d. 2.33; m.p.
1410°C; b.p. 2355°C. Silicon is the
second most abundant element in
the earth’s crust (25.7% by weight) ocSi
O
O
O
O
=
SiO
4– as in Be 2 SiO 4 (phenacite)
Si 2 O
2– as in Sc 2 Si 2 O 7 (thortveitite)
Si 3 O
6– as in BaTiSi 3 O 9 (bentonite)
Si 6 O
12– as in Be 3 Al 2 Si 6 O 18 (beryl)
18
9
5
4
single chain : pyroxenes
double chain : amphiboles
sheet : micas
Structure of some discrete silicate ions
Structure of some polymeric silicate ions
Silicate minerals
Structure of some polymeric silicate ions
Structure of some discrete silicate ions
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482
s
silicides are structurally similar to
the interstitial carbides but the range
encountered is more diverse. They
react with mineral acids to form a
range of *silanes.
silicon Symbol Si. A metalloid element belonging to *group 14 (formerly IVB) of the periodic table; a.n.
14; r.a.m. 28.086; r.d. 2.33; m.p.
1410°C; b.p. 2355°C. Silicon is the
second most abundant element in
the earth’s crust (25.7% by weight) ocSi
O
O
O
O
=
SiO
4– as in Be 2 SiO 4 (phenacite)
Si 2 O
2– as in Sc 2 Si 2 O 7 (thortveitite)
Si 3 O
6– as in BaTiSi 3 O 9 (bentonite)
Si 6 O
12– as in Be 3 Al 2 Si 6 O 18 (beryl)
18
9
5
4
single chain : pyroxenes
double chain : amphiboles
sheet : micas
Structure of some discrete silicate ions
Structure of some polymeric silicate ions
Silicate minerals
Structure of some polymeric silicate ions
Structure of some discrete silicate ions
www.AzShimi.ir www.AzShimi.com