Coordination Complexes Video Lessons

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Problem: For each complex, determine the number of d electrons in the metal ion.1) [Fe(CN)6]3-2) [Fe(CN)6]4-3) Co(NH3)6]2+4) [CoF6]3-5) [Mn(H2O)6]2+

FREE Expert Solution

We are asked to determine the number of d electrons in the metal ion.

To do so, we shall use the formula below:

number of d electrons=Group Number-Charge

[Fe(CN)6]3-

The charge of Fe (denote as x)  in the complex is:

x + 6 (-1)  = -3

x - 6 = -3

  +6       +6

x = + 3

Fe is in Group 8 and has a charge of +3, therefore the number of d electrons is:

number of d electrons = 8 - (+3) = 5

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Problem Details

For each complex, determine the number of d electrons in the metal ion.


1) [Fe(CN)6]3-


2) [Fe(CN)6]4-


3) Co(NH3)6]2+


4) [CoF6]3-


5) [Mn(H2O)6]2+

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