Give systematic names for the following formulas:

1. $\mathit{K}\mathbf{\left[}\mathbf{A}\mathbf{g}{\mathbf{\left(}\mathbf{C}\mathbf{N}\mathbf{\right)}}_{\mathbf{2}}\mathbf{\right]}$
2. $\mathit{N}{\mathit{a}}_{\mathbf{2}}\mathbf{\left[}\mathbf{C}\mathbf{d}\mathbf{C}{\mathbf{l}}_{\mathbf{4}}\mathbf{\right]}$
   
3. $\mathbf{\left[}\mathbf{C}\mathbf{o}{\mathbf{\left(}\mathbf{N}{\mathbf{H}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{4}}\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\mathbf{\right)}\mathbf{B}\mathbf{r}\mathbf{\right]}\mathit{B}{\mathit{r}}_{\mathbf{2}}$
   

A coordination complex is made up of a core atom or ion, known as the coordination center, which is typically metallic, and an array of attached molecules or ions that are known as ligands or complexing agents.

We must state certain principles for identifying coordination compounds in order to solve issues like these:

- cation is named before the anion

- In the complexion, we name ligands before metal ions, in alphabetical order

- A numerical prefix is the number of ligands of a particular type

- The oxidation state of the metal ion is written by roman numerals in parentheses if the metal ion has more than one oxidation state

- If the complex ion is an anion, we add -ate instead of the ending of the metal name

- Neutral ligands most often have molecule names, but anionic ligands lose the -ide and add -o after the root name

a)$K\left[\mathrm{Ag}{\left(\mathrm{CN}\right)}_2\right]$- potassium dicyanoargentate(l)

b)$N{a}_2\left[{\mathrm{CdCl}}_4\right]$- sodium tetrachlorocadmate (II)

c)$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4\left({\mathrm{H}}_2\mathrm{O}\right)\mathrm{Br}\right]B{r}_2$- tetraammineaquabromocobalt (III)