Cobalt = Co transition metal and has a charge of 3+
Bromide = Br halogen and has a charge of 1-
Co of 3+ and Br of 1-
Cross method
Metal First
Formula: CoBr3
Co+2 Br-1 <--- these are the ions and their charges
Co+2 Br-1 Br-1 <--- the charges have to add up to zero, so one+2 cobalt ion cancels out two -1 bromine ions
CoBr2 <--- simplify
CoBr6 Cobalt is +6 (that's what the Roman numeral VI tells you) and bromine has a charge of -1, so you need 6 of them. I don't know that Co(VI) bromide exists - Co tends to form +2 and +3 complexes, not +6.
CaBr3 --
---cLaiRe...
CoBr3, calcium is Ca
Formula: CoBr2
CoCl3
CoB2
Co2(SO4)6
Co(BrO3)2
Co2S3 is the formula for cobalt (III) sulfide.
Iodite is the hypothetical polyatomic ion, IO2-. Cobalt(III) carries a 3+ charge. Therefore Cobalt(III) iodite: Co(IO2)3
The chemical formula of sodium bisulfate is NaHSO4.
The chemical formula for zinc bisulfate is Zn(HSO4)2.
Formula: NH4HSO4
Cobaltic Bisulfate The formula is poorly constructed. It should probably appear as Co(HSO4)3. "Cobaltic" is somewhat archaic. The Stock system, using Roman numerals, is preferred. Therefore, it would be called cobalt (III) bisulfate or cobalt (III) hydrogen sulfate.
CoCl3
The formula for Cobalt III nitrate is Co(NO3)3
The formula for cobalt (III) carbonate is Co2(CO3)3.
The chemical formula for cobalt(III) acetate is (CH3CO)3Co.
The formula for cobalt III nitride is CoN.
The formula unit for cobalt(III) nitride is CoN.
Co2(CO3)3The chemical formula of cobalt(III) carbonate [not cobalt(111)] is Co2(CO3)3.
The formula for cobalt(III) chromate is Co2(CrO4)3.
The ionic chemical formula of cobalt(III) chloride is: (Co)3+ + 3 Cl-.
Co2O3
Co2S3 is the formula for cobalt (III) sulfide.