Which of the following is a correct formula for calculation of EAN (Effective atomic number)?
Answer & explanation
Correct answer: option 3
The correct answer is option 3. EAN = Z - (O.N) + 2(C.N.)
where Z = Atomic number
O.N. = Oxidation number
C.N. = Co-ordination number
Transition metal form coordination compounds very readily because they have vacant 'd' orbitals which can accommodate electron pairs donated by ligands. Metal ion in the complex tends to attain nearest stable inert gas configuration by gaining electrons from ligands.
Effective atomic number is given by
EAN = Z - (O.N) + 2(C.N.) or number of lone pairs donated to the central atom
where Z = Atomic number
O.N. = Oxidation number
C.N. = Co-ordination number