We are asked to determine the number of d electrons in the metal ion.
To do so, we shall use the formula below:
The charge of Fe (denote as x) in the complex is:
x + 6 (-1) = -3
- 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
For each complex, determine the number of d electrons in the metal ion.
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