# How does the oxidation number change for copper in step one?

Feb 13, 2017

You have stumped us here! Where is $\text{step 1}$?

#### Explanation:

Copper metal can undergo several redox transformations:

$C u \rightarrow C {u}^{+} + {e}^{-}$

$C u \rightarrow C {u}^{2 +} + 2 {e}^{-}$

$C {u}^{3 +}$ is known, but not at A level or undergraduate level.

Of course, the standard electrochemistry tables report reductions, not oxidations. What transformations are shown here?