# What kinds of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one to the other?

Dec 30, 2015

The chlorine atom is reduced; the sodium atom is oxidized.

#### Explanation:

Heat sodium metal up in an atmosphere of chlorine gas, and a redox reaction occurs; a transfer of electrons.

$N a \rightarrow N {a}^{+} + {e}^{-}$;

Sodium (gas) is oxidized.

$\frac{1}{2} C {l}_{2} + {e}^{-} \rightarrow C {l}^{-}$.

Chlorine gas is reduced.

Add these reactions together, and we get:

$N a + \frac{1}{2} C {l}_{2} \rightarrow N a C l$

This is certainly a redox reaction, and the individual reaction enthalpies may be precisely measured and defined.