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: '''Half equations''' use the letter 'e' to represent [[electron]]s.
: '''Half equations''' can be taken from [[Balanced Symbol Equation|balanced symbol equations]].
: The total [[charge]] on each side of a '''half equation''' must add to zero.
: The number of each [[element]] must be the same on both sides of a '''half equation'''.
===Examples===
'''Half Equation''' at [[anode]]: 2O<sup>-2</sup> → O<sub>2</sub> + 4e<sup>-</sup>
{| class="wikitable"
| style="height:20px; width:150px; text-align:center;" |[[Balanced Symbol Equation]]
| style="height:20px; width:150px; text-align:center;" |2Li<sub>2</sub>O → 4Li + O<sub>2</sub>
| style="height:20px; width:150px; text-align:center;" |Text
| style="height:20px; width:150px; text-align:center;" |Text
|-
| style="height:20px; width:150px; text-align:center;" |'''Half Equation''' at [[cathode]]
| style="height:20px; width:150px; text-align:center;" |Li<sup>+</sup> + e<sup>-</sup> → Li
| style="height:20px; width:150px; text-align:center;" |Text
| style="height:20px; width:150px; text-align:center;" |Text
|-
| style="height:20px; width:150px; text-align:center;" |'''Half Equation''' at [[anode]]
| style="height:20px; width:150px; text-align:center;" |2O<sup>-2</sup> → O<sub>2</sub> + 4e<sup>-</sup>
| style="height:20px; width:150px; text-align:center;" |Text
| style="height:20px; width:150px; text-align:center;" |Text
|}