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20.
Composés
XF 2
X 3 P0 4
X2(S04)3
X203
Na 2 X
XP0 4
Famille
Exemples
lia (2)
CaF 2
li b (12)
ZnF 2
la (l)
Na 3 P0 4
lb (l l)
Ag 3 P0 4
Ilia (l 3)
Al 2 (S0 4 ) 3
lilb (3)
Sc 2 (S0 4 ) 3
Vlb (6)
Cr 2 (S0 4 ) 3
VIII (7)
Mn 2 (S0 4 ) 3
etc.
Ilia (l 3)
Al 2 0 3
Va (l S)
N203
ll lb (3)
Via
Na 2 S
Ilia (13)
AIP0 4
lllb (3)
ScP0 4
139