Вопрос жизни и смерти...20б даю
Визначте ступені окиснення елементів у речовинах:ALF3, BaCL2, Cas, КЗР, N203, PbCL4, CL207, BI3, Naf, P4, CuI2, MgS, Ca0, CS, AL4C3,PCL5,Fe2S3.
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