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Question

In the complex [Ni(H2O)2(NH3)4]2+ the no. of unpaired electrons is


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Solution

Cordinanation compounds:

  • A coordination complex may be defined as a compound that results from the combination of two or more stable chemical species and retains its identity in the solid as well as the dissolved state.
  • The cation to which one or more neutral molecules or ions are coordinated is called the central ion.
  • The molecules or ions so attached are called ligands.
  • The atom in the ligand which can donate the electron pair is called the donor atom.
  • The total number of ligands attached to a central ion is called the coordination number of that ion.
  • The central ion together with molecules or ions coordinated with it constitutes what is termed a coordination complex.

The number of unpaired electrons:

  • In Tetraamminediaquanickel(II) ion [Ni(H2O)2(NH3)4]2+ , Ni is in +2 oxidation state (since water and Ammonia ligands are neutral ligands)
  • The electronic configuration of Nickel is [Ar]3d84s2

  • There are 8 electrons in 3d subshell and since the NH3 is a strong field ligand, the two unpaired electrons left get paired up.
  • Hence the number of unpaired electrons becomes zero.

Therefore, in the complex [Ni(H2O)2(NH3)4]2+ the no. of unpaired electrons is zero.


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