First off, you have the equation written wrong... those are Ls not Is. so it's
Al2(CO3)3 + ZnCl2 = ZnCO3 + AlCl3
The balanced form of that equation is Al2(CO3)3 + 3 ZnCl2 = 3 ZnCO3 + 2 AlCl3
So the coefficients are 1,3,3,2
Aluminum chloride
LiCI
Probably you think at AlCl3, aluminium trichloride.
Aluminium chloride does not exist as seperate atoms as it is an ionic compound.
Aluminium trichloride has 4 atoms in the formula unit.
For any chloride ion the charge is ALWAYS '-1' So in AlCl3 can be split into its ions as 'A;l^(3+). and 3 Cl^(-)' Note the charges MUST balance. the '3+' is balanced by three lots of (-).
The formula as given does not correspond to any actual compound. Assuming that it was intended to read "AlCl3", its formally correct name is "aluminum trichloride" if it is considered a covalent compound and "aluminum (III) chloride" if it is considered ionic. (In Britain and many formerly British possessions, "aluminum" is spelled "aluminium".)
Each separate chlorine ion will have a charge of 1-. This is because chlorine has 7 valence electrons, so it needs one more electron to become stable.
Under IUPAC naming conventions, AlCl3 is called aluminum chloride. It is also commonly called aluminum trichloride and aluminum (III) chloride.