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Oxidation Numbers

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Li
+1
Na
+1
K
+1
Rb
+1
Cs
+1
Fr
+1
Be
+2
Mg
+2
Ca
+2
Sr
+2
Ba
+2
Ra
+2
H
+1 in combination with non-metals
-1 in combination with metals and boron
F
-1
O
-1 in peroxides
-2 in all other compounds (except with F)
Cl
−1 in combination with metals, nonmetals (except O), and other halogens lower in the group
Br
−1 in combination with metals, nonmetals (except O), and other halogens lower in the group
I
−1 in combination with metals, nonmetals (except O), and other halogens lower in the group
At
−1 in combination with metals, nonmetals (except O), and other halogens lower in the group