What is EAN rule and explain it
Answers
Answer:
Explanation:
Effective atomic number (EAN), number that represents the total number of electrons surrounding the nucleus of a metal atom in a metal complex. It is composed of the metal atom’s electrons and the bonding electrons from the surrounding electron-donating atoms and molecules. Thus the effective atomic number of the cobalt atom in the complex [Co(NH₃)₆]³⁺ is 36, the sum of the number of electrons in the trivalent cobalt ion (24) and the number of bonding electrons from six surrounding ammonia molecules, each of which contributes an electron pair (2 × 6 =12).
By using this rule it is possible to predict the number of ligands in these types of compounds and also the products of their reactions. The EAN rule is often referred to as the “18-electron rule” since, if one counts only valence electrons (6 for Co³⁺ and 2 × 6 = 12 for 6 NH₃), the total number is 18.