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Question
Find EAN of Co3+ in Co [NH3]63+.
Numerical
Solution
EAN of Co3+ in Co [NH3]63+:
Z = 27 (for Co)
Y = e− donated by ligands = 12
(6NH3 × 2 = 12)
X = e− lost by metal = 3
∴ EAN of Co3+ in Co[NH3]63+
= Z − X + Y
= 27 − 3 + 12
= 36
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Effective Atomic Number (EAN) Rule
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