Question

What is the name of the compound $[Co{(N{H_3})_4}{(N{O_2})_2}]N{O_3}$ ?

Answer 1

A coordination compound consists of a central metal atom which is mainly a d-block element and there are ligands which are either donor atoms or groups which share its lone pair with the central metal atom and coordinate complexes are formed.

Complete answer:
There are some rules that need to be followed for naming coordination complexes.
The cation is named first and then anion is named.
While naming the coordination sphere, first ligands are named and then the central metal atom is named along with its oxidation state in roman alphabets.
If the coordination sphere is anionic, we apply the suffix ‘ate’ at the end of central metal
Those ligands whose names are already having dai, tri in their names and when these ligands are repeated, Bis, tris is used for their repetition.
Now coming to our question;
The given compound is a coordination compound where the coordination sphere is cationic. The oxidation state of $Co$ is;
$x + 4(0) + 2( - 1) = + 1$
$x = + 3$
The oxidation state of $Co = + 3$
The name of the compound will be;
Tetraamminedinitrocobalt(III) nitrate
Here, the coordination sphere is cationic that’s why it is written first followed by the anion (nitrate). Also, in coordination sphere ligands are named first followed by metal atoms (Co) with oxidation state that came out $+ 3$ .

Note:
It should be noted that the given set of rules needs to be followed while naming any coordination compound. In some coordination compounds there are bridging ligands present in such cases $\mu$ is used before the name of different bridging ligands. Thus, bridging ligands between two metal ions have the prefix $\mu$ .