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2) Ca-II , O-II
3) P-V , O-II
4) C-IV , H-I
5) Mg-II , O-II
6) N-III , O-II
2.CaO- Ca(II) i O (II)
3.P2O5-P(V) i O(II)
4.CH4-C (IV) i H (I)
5.MgO-Mg (II) i O (II)
6.N2O3 -N(III) i O (II)