Question

What is ‘effective atomic number’ (EAN)?

Answer 1

It is total number of electrons around the central metal ion present in a complex and calculated as the sum of electrons on the metal ion and the number of electrons donated by ligands. It can be calculated using formula,
EAN =Z-X+Y
where Z = Atomic number of metal.
X = Number of electrons lost during the formation of metal ion from its atom.
Y = Number of electrons donated by the ligands.