ean of cobalt in [co(en)2cl2 ]^+

EAN is calculated as follows:

Cobalt:

Atomic number = 27

Ground Electronic configuration:  3d⁷4s²

Co³⁺ electronic configuration : 3d⁶4s⁰

EAN = 27 - (+3) + (4$\times$2) + 2​$\times$2 = 36

 [4 for Ethylenediamine as it is a bidentate ligand and 2 for one Cl each].