# In reactions between metals, and gases, which is likely to be the oxidizing agent?

Oxidants accept electrons; dioxygen gas gives ${O}^{2 -}$ when it oxidizes something, i.e. accepts electrons. A reducing agent donates electrons.
Given this, elemental metals tend to be reducing agents, and oxidants tend to be non-metals. $C {l}_{2}$ gas is thus the most potent oxidant, as it accepts electrons to give chloride ions, $C {l}^{-}$.