How is a net ionic equation written from a complete ionic equation?

Net ionic equation can be written from complete ionic equation by canceling the spectators ion from complete ionic equation.

For example:

Balanced Chemical equation:

HClO₂ (aq) + NaOH (aq) → H₂O (l) + NaClO₂ (aq)

Ionic equation:

H⁺ (aq) + ClO₂⁻ (aq) + Na⁺ (aq) + OH⁻ (aq) → H₂O (l) + Na⁺ (aq) + ClO₂⁻ (aq)

Net ionic equation:

H⁺ (aq) + OH⁻ (aq) → H₂O (l)

The ClO₂⁻ (aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.

the spectator ions are removed