How to calculate effective atomic number in chemistry

1.	How to calculate effective atomic number in chemistry
Answer» Effective atomic number, 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. The effective atomic number 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.

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