are metallic cadmium and metallic iron more likely to be reducing or oxidizing agents?

Answer 1

Both have oxidation number 0 when they are in the metal elemental state and usually they form cations (oxidation number>0).

A reducing agent will reduce another compound while itself oxidizes, meaning an increase in its own oxidation number.

Therefore since metallic cadmium and iron tend to increase their own oxidation number from 0 to +2 and +2 or +3 respectively (and reduce that of another substance) they are reducing agents.

Answer 2

If you mean cadmium[0] and iron[0], well, they'r both metals, so I expect them to be reducing agents