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: [[Hydrogen]] forms '''positive ions''' in some [[compound]]s and it is these [[Hydrogen Ion|H<sup>+</sup> ions]] which can make [[solution]]s [[acid]]ic.
: '''Positive ions''' are attracted to [[Negative Ion|negative ions]] and to the [[Cathode|negative electrode (cathode)]] during [[electrolysis]].
===Examples===
{| class="wikitable"
|-
|[[File:LithiumIonFormation.png|center|200px]]
|[[File:MagnesiumIonFormation.png|center|200px]]
|[[File:AluminiumIonFormation.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |[[Lithium]] forms +1 [[ion]]s.
| style="height:20px; width:200px; text-align:center;" |[[Magnesium]] forms +2 [[ion]]s.
| style="height:20px; width:200px; text-align:center;" |[[Aluminium]] forms +3 [[ion]]s.
|}