The ligand $N(CH_2-CH_2-NH_2)_3$ is : $-$

In $EDTA^{4-}$,the donor atoms are:

In the coordination complex $[E(en)_2(C_2O_4)]NO_2$,the coordination number and oxidation state of $E$ are respectively:

$A$ complex of platinum,ammonia,and chloride produces four ions per molecule in the solution. Which structure is consistent with this observation?

What is the coordination number of $Co$ in the complex $[CoF_6]^{3-}$?

The sum of the coordination number and the oxidation number of the metal $M$ in the complex $[M(en)_2(C_2O_4)]Cl$ (where $en$ is ethylenediamine) is: