The formula for Magnesium Nitride?
I know the formula for Magnesium nitride is Mg_3N_2 but why? On my test I put Mg(NO)_2 which was wrong. The charge for MG is 2+ and N is 3- and isn't nitiride NO2? I'm confused..
I suck at chemistry..
- JohnLv 77 years agoFavorite Answer
NO₂ is a polyatomic ion called a nitrite. It's 'brother', NO₃, is called nitrate. When writing the formula for compounds when the name is given, check out the ending of the 'second name'. If the compound's name ends in -'ide', it's probably a binary compound (one containing only two kinds of elements). There are exceptions to this like a compound containing the hydroxide (OH⁻) polyatomic ion. The name of most polyatomic ions formed with a non-metal combined with oxygen end in -ite, or -ate. Examples, in addition to the nitrite and nitrate are: carbonate (CO₃) hydrogen carbonate, HCO₃, sulfite (SO₃), sulfate (SO₄).
Magnesium nitride is Mg₂N₃. The -ide ending tells us its binary and therefore contains only Mg⁺² and N⁻³. Balancing the charges requires 3 Mg's and 2 N's.
- Anonymous7 years ago
NO2 is nitrite (not nitride) which has a single negative charge. so magnesium nitrite will be Mg(NO2)2
with NO2 (-1) the O has a 4- charge but the N actually has a 3+ oxidation state totaling 1-
nitride ion stands for N (3-) ion so magnesium nitride is Mg3N2
- 7 years ago
Nitride is N3-
Nitrite is NO2-
Nitrate is NO3-
Magnesium ion is Mg2+
Mg2+ has valency II
N3- has valency III
Therefore Mg3N2Source(s): Other guy is wrong with NO2
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- 7 years ago
NO2- is nitrate...so basically what u'd written was Magnesium nitrate.
N3- is a nitride.
since Magnesium forms an Mg2+ ion and nitrogen an N3-,
3Mg + 2N -----> Mg3N2Source(s): self