Chapter ER, Problem 3PQ

Interpretation Introduction

Interpretation:

The oxidation number of chromium in ${\text{Na}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$ has to be given.

Concept Introduction:

Oxidation number:

The oxidation of an atom is the charge that atom would have if the compound was composed of ions.  The oxidation number of an atom depends on the other atoms in the substance. For example,

• In $\text{KCl}$ the oxidation number of Cl is 0.
• In $\text{Cl}₂\text{,}$ the oxidation number of Cl is $\text{-1}\text{.}$