When does the end of a negative ion become -ide?

Answer 1

Corrected:

No: When it is a halogen!!

Yes:

They are 'made' of one anionic atom: it is for salts of negatively charged, non-metal and mono-elemental ions.

Simplier said: they are negative, single ions of non-metals

Examples:

Cl- chloride, S2- sulfide, N3- nitride, C4- carbide, and of course last but not least: oxide with O2-.

Answer 2

When a non-metal atom becomes an ion, you add the -ide suffix. This will happen when it bonds with a metal. So, when sodium and chlorine bond, the chlorine (being a non-metal) forms a negative ion, so it becomes chloride. The compound therefore is sodium chloride.

Answer 3

Because that's the convention. The -ide ending comes from analogy with oxide, meaning "compound of oxygen and another element", and the word oxide itself is a portmanteau of ox(ygene) and (ac)ide, because many of the oxygen compounds known at the time were acids (the word "oxygen" itself comes from Greek words meaning "acid former"). As you might guess from the roots, "oxide" was originally a French word before being adopted into English.

However, I would be remiss in not stating that not all negative ions end in -ide. Most negative polyatomic ions do not; -ate or -ite are common (determining which to use for any given ion is largely an exercise in memorization; there is an underlying logic to it, but it requires knowledge of common oxidation states for the non-oxygen part of the polyatomic ion, and for most students who are just learning them it's probably easier to just memorize the names).

Answer 4

if the negative ion is a single element the end of the name changes to -ide

Answer 5

The ending -ide is given. For example, Cl- is chloride. S2- is sulfide, etc. etc.

Answer 6

This is only a convention in the English language: the anion of a chemical element (ex.: chloride).

Answer 7

-ide