Since hydrogen ions cannot exist alone and exist only after combining with water molecules, they must always be shown as which among the following, represented as \(H_3O^+\)?
Hydronium ion
Since hydrogen ions cannot exist alone and combine with water molecules, they are represented as hydronium ions, \(H_3O^+\).
Oxide ion, hydrogen gas and hydroxide ion describe entirely different chemical species, not this specific combined ion form.
Hence, Hydronium ion is the correct answer.
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