помогите ! 75 балов ! ХимичСРОЧНООООООО

Визнач валентність елементів у таких сполуках:

I. N_{2}*O_{5} Mn*O_{2} , K_{2}*O , S*O_{3} C*O_{2} , N*H_{3} ZnO, H_{2}*S

II II. MnC*l_{2} MnS, MnO, Mn*I_{2} ,, Mn*O_{2} , M*n_{2}*O_{7}
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