The formula for the oxide ion is O2-, and the formula for the nitrate ion is NO3-.
Nitrogen fixation
The individual ions for calcium fluoride have the formulas Ca+2 and F-1 respectively. That means that in any sample of calcium fluoride, there must be twice as many of the fluoride ions.
Ammonium ions
Lead nitrate or Pb(NO3)2 , contains divalent lead ions. While Silver nitrate or AgNO3 , contains monovalent silver ions
If you mean in barium nitrate, the formula is Ba(NO3)2, which is a ratio of 1Ba:2NO3.
Nitrogen fixation
Molecular mass of sulfuric acid is 98 u. Molecular mass of potassium and nitrate ions are 39 and 62 respectively. The molar mass of potassium nitrate is 101u.
The ammonium (NH4+) ion does not contain nitrates or nitrites, which are entirely different ions, the the formulas NO3- and NO2- respectively. However, Ammonium nitrate, NH4NO3 is a fairly common substance. There is also a such thing as ammonium nitrite NH4NO2
The individual ions for calcium fluoride have the formulas Ca+2 and F-1 respectively. That means that in any sample of calcium fluoride, there must be twice as many of the fluoride ions.
Ammonium ions
Nitrite ions can form nitrate ions by reacting with oxidizing agents such as the oxygen in air.
iron(II) oxide is FeO and has two ions Fe2+ and O2-
The spectator ions are Ag+ and (NO3)-.
Ammonium = NH4+ Nitrate = NO3-
Lead nitrate or Pb(NO3)2 , contains divalent lead ions. While Silver nitrate or AgNO3 , contains monovalent silver ions
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If you mean in barium nitrate, the formula is Ba(NO3)2, which is a ratio of 1Ba:2NO3.