Complexes (ML₅) of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal geometries, respectively. The sum of the 90°, 120° and 180° L–M–L angles in the two complexes is

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Strategy:
 Map out the idealized geometrical angles for a square pyramidal and trigonal bipyramidal structure.

Step 1: Square Pyramidal Angles (Ni complex)
In an ideal square pyramid (base of 4 ligands, 1 apical):
- Angles between adjacent basal ligands: 4 .
- Angles between apical and basal ligands: 4 .
- Total  angles = 8.
- Angles between trans basal ligands: 2 .
-  angles = 0.

Step 2: Trigonal Bipyramidal Angles (Fe complex)
In an ideal trigonal bipyramid (3 equatorial, 2 axial):
- Angles

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