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Li
+
Na
+
K
+
Rb
+
Cs
+
Be
+2
Mg
+2
Ca
+2
Sr
+2
Ba
+2
Sc
+3
Y
+3
La
+3
Al
+3
N
-3
O
-2
S
-2
Se
-2
F
-
Cl
-
Br
-
I
-