The sodium ions are in the oxidation state of +1.

Sodium ions play a diverse and important role in many physiological processes.

In some bacteria, sodium ions may be used instead.

The sodium ion itself is used for electrical signaling in the nervous system.

The sodium ions introduced do not make water 'hard'.

The influx of sodium ions causes an increase in voltage.

The sodium ions more or less just roam around.

When the resin is fresh, it contains sodium ions at its active sites.

Saltiness is a taste produced primarily by the presence of sodium ions.