Which of the following complex species does not obey EAN rule?
Answer & explanation
Correct answer: option 2
EAN is effective atomic number and it is represented as:
EAN = Z - (O.N) + 2(C.N) or number of lone pairs donated to central atom
where Z = atomic number
O.N. = oxidation number
C.N. = coordination number
In [Cr(NH3)6]3+
x + 6(0) = +3
x = 3
Cr3+ (Z = 24)
EAN = 24 - 3 + 2(6) = 21 + 12 = 33