IIIA/13
IVA/14
VA/15
VIA/16
VIIA/17
Bor
ate
B
O
3
3-
Carbon
ate
C
O
3
2-
Nitr
ate
N
O
3
1-
Silic
ate
Si
O
3
2-
Phosph
ate
P
O
4
3-
Sulf
ate
S
O
4
2-
Chlor
ate
Cl
O
3
1-
Arsen
ate
As
O
4
3-
Selen
ate
Se
O
4
2-
Brom
ate
Br
O
3
1-
Iod
ate
I
O
3
1-