Question

What does the ending –ide mean in the name of an ionic compound?

Answer 1

Ionic compounds are chemical compounds made up of ions which are held together by electrostatic forces referred to as ionic bonding. Ionic compounds are neutral because they consist of positively charged ions which are cations and a negatively charged ion i.e. anion. Moreover, cations being positively charged contain few electrons as compared to protons whereas, anion being negatively charged contains more electrons as compared to protons.

Complete answer:
The –ide ending on the name of an ion means it is an anion or a negatively charged ion or non-metals.
-ide is used as a suffix at the end of the name of an atom when any non-metal is present singly and bears a negative charge. Negative ions that comprise a single atom are named by adding the suffix –ide to the element's root name, for example,${F^ - }$ is fluoride, $C{l^ - }$ is chloride, ${O^{2 - }}$ is oxide, and ${S^{2 - }}$is sulphide.
For naming any Binary compounds, cation i.e. a positively charged ion or metal has the element’s root name and then anion’s root name is taken, and then the suffix “–ide” is added instead of –“ine”.
So, -ide is used for non-metals or anions.

Note:
In the naming of polyatomic ions, the –ite ending signifies a low oxidation state like $NO_2^ -$ is known as Nitrite ion. –ate ending specifies a high oxidation state, for example, $NO_3^ -$ is known as Nitrate ion.
Hypo- prefix indicates the lowest oxidation state, for example, $Cl{O^ - }$ is hypochlorite ion but the “per-” prefix indicates a higher oxidation state like $ClO_4^ -$ is perchlorate ion.