Which rule is used for writing the name of an ionic base?
the chemical name begins with "hydro."
the chemical name ends with "hydroxide."
the "ide" ending is changed to "ic.
the polyatomic "ate" ending is changed to "ic."

The chemical name of an ionic base ends with "hydroxide."

Explanation:

Bases are defined as the chemical species which donates hydroxide ions when dissolved in water.

Ionic base is formed by the combination of metal with hydroxide ion. The name of any ionic base will end with the word 'hydroxide'

For Example: NaOH is formed by the combination of sodium ion and hydroxide ion and is named as sodium hydroxide

Hence, the chemical name of an ionic base ends with "hydroxide."