Why most of the elements react with hydrogen & oxygen, why not with some other gas or non-metal? Why only these two?
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Almost all metals and nonmetals react with hydrogen at high temperatures. At elevated temperatures and pressures hydrogen reduces the oxides of most metals and many metallic salts to the metals.
Oxygen's high reactivity is due to its biradical electron configuration. As shown in a molecular orbital drawing of O2, the two unpaired electrons make the molecule highly susceptible to bond formation. Oxygen has two allotropes (dioxygen, O2, and ozone, O3), both excellent oxidizing agents (Table P2).
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