Complexes (\(\mathrm{ML_5}\)) of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal grometries, respectively. The sum of the \(90^\circ\), \(120^\circ\) and \(180^\circ\) L-M-L angles in the two complexes is _________.
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Correct Answer: 20
Solution and Explanation
Square pyramidal (Ni): 4 basal ligands + 1 apical. Apical-basal angles: 4 at 90°. Adjacent basal-basal: 4 at 90°. Trans basal-basal: 2 at 180°. Total = 4 + 4 + 2 = 10 angles (8 of 90°, 2 of 180°).
Trigonal bipyramidal (Fe): 3 equatorial + 2 axial. Equatorial-equatorial: 3 at 120°. Axial-equatorial: 6 at 90°. Axial-axial: 1 at 180°. Total = 3 + 6 + 1 = 10 angles.
Sum = 10 + 10 = 20.
Answer: 20
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