what is the formula of tetrahydroxo zincate (ll)
In coordination compounds we study about the nomenclature of complex compounds.
Now, for metal (in its +2 coordinated state) the suffix ate is used.
And tetra means 4 , hydroxo means OH.
So,
And the more electronegative ions (called ligands) always make compound in coordination with less electronegative metal where the metal is in central position and is coordinated by ligands.
The IUPAC nomenclature of Tetrahydroxozincate(II)
ion is[Zn(OH)4]2-