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 ends with “hydroxide.”

Explanation:

1- we write the name of the metal first and after that write the nonmetal:

Ex : NaOH ( sodium hydroxide)

2- any compound contains OH group is an ionic base and this group called hydroxide group

3- "Ous" ending is given in the ions with the lower oxidation.

4- " ic" ending is given in the ions with the higher oxidation.

So, the correct answer is: The chemical name ends with “hydroxide.”.