The coordination number and the oxidation state of the element ' $\mathrm{E}$ ' in the complex…
The coordination number and the oxidation state of the element ' $\mathrm{E}$ ' in the complex $\left[\mathrm{E}(\mathrm{en})_2\left(\mathrm{C}_2 \mathrm{O}_4\right)\right] \mathrm{NO}_2$ (where (en) is ethylene diamine) are, respectively,