Why do lithium and sodium corrode so easily? [closed]








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I want to know what is the phenomenon and explanation behind this corrosion. What is the reaction?




$$\ce{2Li + 2H2O -> 2LiOH + H2}$$
$$\ce{2LiOH + CO2 -> Li2CO3 + H2O}$$ 
$$\ce{4Li + O2 -> 2Li2O}$$ 
$$\ce{Li2O + CO2 -> Li2CO3}$$
$$\ce{6Li + N2 -> 2Li3N}$$
Lithium and sodium are reacting with the gases in the air; a destructive physical process.


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