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Mg, Ca, Sr, Ba + O
2
, N
2
Mg
2Mg + O
2
2MgO
3 Mg + N
2
Mg
3
N
2
Ca
2 Ca + O
2
2 CaO
3 Ca + N
2
Ca
3
N
2
Sr
2Sr + O
2
2SrO
3 Sr + N
2
Sr
3
N
2
Ba
2 Ba + O
2
2 BaO
3 Ba + N
2
Ba
3
N
2
2MgO
