Identify the spectator ions in the following complete ionic equation.
ba2+(aq)+2i−(aq)+2na+(aq)+so2−4(aq) →baso4(s)+2i−(aq)+2na+(aq)

Ba2+(aq)+2I−(aq)+2Na+(aq)+SO2−4(aq)→BaSO4(s)+2I−(aq)+2Na+(aq)

The spectator ions are:    Na⁺,  I⁻.

They appear on both sides of the reaction, hence did not take part in the reaction.

Outermost (valence) electrons

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