How to find ean in coordination compounds?
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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 ligands 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
• 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 ligands 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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