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What is effective atomic number (EAN) ? Calculate EAN of cobalt (Z=27) in [CO(NH_(3))_(6)]^(+3) and of zinc (z=30) in [Zn(NH_(3))_(4)]SO_(4). |
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Answer» Solution :Effective Atomic Number (EAN) : EAN 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 electron from the surrounding electron donating atom and molecules. CAlculation of EAN : `[Co(NH_(3))_(6)]^(+3)""Co^(3+)` electrons = 24 Each `NH_(3)` CONTRIBUTES 2 bonding electrons. THUS 6 `NH_(3)` contributes `6xx2=12` bonding electrons. Thus, EAN of cobalt in `[CO(NH_(3))_(6)]^(3+)` is 24+12=36 `[Zn(NH_(3))_(4)]SO_(4)""Zn^(2+)` electrons = 28 Each `NH_(3)` contributes 2 bonding elctrons. Thus 4 `NH_(3)` contributes `4xx2=8` bonding elctrons. Thus, EAN of Zn in `[Zn(NH_(3))_(4)]SO_(4)` is 28 + 8 = 36 |
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