Ada yang Bisa tentukan A,B,C,D,E ?

a. Cr2(SO4)3 biloks SO4 = -2 o/ krn itu biloks 2Cr + -2(3) = 0 ~~ 2Cr = 6 ~~ cr = +3

CrO4^-2 = Cr + -8 = -2 ~~ Cr = +6

Cr2O7^2- = 2Cr + -14 = -2 ~~ Cr = +6

b c d e caranya sama golongan IA biloks = +1 golongan 7 Biloks = -1 , oksigen = -2