Q12 of 55 Page 1

Write the state of hybridization, shape and IUPAC name of the complex [Co(NH3)6]3+ . (Atomic number of Co=27).

Electronic configuration of Co: [Ar]3d74s2

Electronic configuration of Co3+ : [Ar]3d64s0



Since NH3 is a weak field ligand no pairing up of electrons occurs. Hence forms a high spin complex.


Since there are 6 ligands the hybridization will be sp3d2 as the inner d-orbitals are not vacant.


Shape of sp3d2 will be octahedral.



IUPAC name: Hexaamminecobalt(III)ion


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