What is the EAN of cobalt in the complex [Co(NH3)6]Cl3?
Answer & explanation
Correct answer: option 3
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
[Co(NH3)6]Cl3 → [Co(NH3)6]3+ + 3Cl-
In [Co(NH3)6]3+
x + 6(0) = +3
x = 3
Co3+ (Z = 27)
EAN = 27 - 3 + 2(6) = 24 + 12 = 36