1
Q
sodium
A
Na (+1)
2
Q
potassium
A
K +1
3
Q
Magnesium
A
Mg +2
4
Q
calcium
A
Ca +2
5
Q
boron
A
B +3
6
Q
aluminium
A
Al +3
7
Q
Carbon
A
C +4
8
Q
phosphorus
A
P -3
9
Q
oxygen
A
O -2
10
Q
sulfur
A
S -2
11
Q
fluorine
A
F -1
12
Q
chlorine
A
Cl -1
13
Q
phosphate
A
PO4 3−
14
Q
sulfate
A
SO4 2-
15
Q
nitrate
A
NO3 -
16
Q
ammonium
A
NH4 +
17
Q
hydroxide
A
OH -
18
Q
carbonate
A
CO3 2-
chemistry elements. valence
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