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tony51092 tony51092
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9 years ago
I know there are charts that have formulas like saying NH4+ is ammonium, but no charts seem to have formulas for Polyatomic ions ending in -ide like Carbide, phosphide,Nitride,sulphide, Chloride, and Oxide. Where is a formula or chart to figure out the names of ions ending in -ide , specifically the ones mentioned above for high school chemistry level .Also wahat is the McK rule in chemistry?
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iliketospamiliketospam
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9 years ago
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Nitride, phosphide, etc. are not polyatomic ions.  Rather, they're anions in which the atom is at its lowest oxidation state.  The formulas are:

Nitride: N(3-)
Phosphide: P(3-)
Oxide: O(2-)
Sulfide: S(2-)
Chloride: Cl(-)  (similar for the other halides: bromide, fluoride, iodide)

Carbide is more complex.  It's non-metallic enough that it seldom if ever forms purely ionic bonds (which would be C(4-)).  Instead, "calcium carbide" is CaC2, and the "carbide" is present as two carbons covalently bonded, 2- charge overall ("acetylenic" carbide, triple bond - and with water, CaC2 does produce acetylene gas).
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