There is no compound with the formula Mg3NO2. There is one with the formula Mg3N2, which is magnesium nitride. Magnesium nitride is an inorganic yellow-green powder.
Mg3 stands for 3 Magnesium and N2 stands for 2 nitrogen when combined they create Magnesium nitride or Mg3N2. :)
Magnesium nitrate is Mg(NO3)2
Mg2NO3 does NOT exist.
magnesium nitrate ^^