How good would Aluminum armor be?

[Anthony]

Originally Posted by sir_pudding

Aluminum has an oxidation number of 3, there are stronger oxidizers (the Group IVA-VIIA metals). Are you saying that they don't occur naturally in any form that would be useable for this?

You want reduction potential, not number (on that table, the top is strong oxidizers, the bottom is strong reducers). All of the stronger reducing agents are alkalines or alkaline earths, and do not occur in pure form in nature.