Określ wartościowość pierwiastków Mgo fe2so3 so2 k20 no3 ch4 cucl2 mn2o7
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Fe2SO3 Fe II, S IV O II
SO2 - S IV O II
K2O - K I; O II
NO3 - I
CH4 C IV
CuCl2 - Cu II Cl I
Mn2O7 Mn VII O II