0
Bria Cummerata ∙
0 in N2
Oxidation number of Si is +4.Oxidation number of O is -2.
-2
-1
+1 for copper in CuI or Cu2I2.
H in H20 is Hydrogen
+1
+1 for each Na and -2 for S
+4 for silicon, -2 for each oxygen
+2 for Zn, +6 for S, -2 for each O
Oxidation number of N is +3. Oxidation number of Cl is -1.
The oxidation number is + for C and -2 for O.
fs
The oxidation number of sulphur in H2S is 2.
4 +4+4+4+4+4+4+4+4=40