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Li, Na, K, Rb, Cs + O
2
& N
2
Li
4 Li + O
2
2 Li
2
O
6 Li + N
2
2 Li
3
N
Na
4 Na + O
2
2 Na
2
O
4Na + O
2
2Na
2
O
K
4K + O
2
2 K
2
O
Rb
Rb + O
2
RbO
2
Cs
4 Cs + O
2
2 Cs
2
O
2 Li2O 
2 Cs2O