Question

Explain mean of effective atomic number?

Answer 1

Answer:

Effective atomic number,

number that represents the total number of electrons surrounding the nucleus of metal atom in a metal complex

Answer 2

EFFECTIVE ATOMIC NUMBER (EAN)

The sum of the number of electrons, donated by all ligands and those present on the central metal ion or atom in complex is called as effective atomic number (EAN).

▶️Generally EAN of central metal ion will be equal to the number of electrons in the nearest noble gas.

▶️ If the EAN of the central metal is equal to the number of electrons in the nearest noble gas then the complex possess greater stability.

▶️ EAN = [(atomic number of central metal) – (the oxidation state of the metal) + (the number of electrons gained by the metal from the brigands through co-ordination)]

▶️ EAN= [Z metal – (ox.state of the metal) + 2(coordination number of the metal)].

For example.  

[Co(NH3)6]3+ →EAN = [27 – 3 + 2(6)] = 36

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