tetrahedral(d0 or d10), low oxidation states for M
square planar (d8)
9 and above
more complicated structures
The coordination number of the central metal ion or atom is the number of donor atoms bonded to it.
Which of the following geometries for the complex ion [Fe(en)Cl4]? are possible?
b) trigonal bipyramidal or square pyramidal
d) trigonal planar
e) tetrahedral or square planar
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