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20.18
Locate on the periodic table below the transition elements with the following
electron configurations. Identify each element.
(a) [Ar] 3d 7 4s2
(c) [Kr] 4d 2 5s2
(b) [Ar] 3d 5 4s1
(d) [Xe] 4f 3 6s2
20.19
What is the general trend in the following properties from left to right across the
first transition series (Sc to Zn)? Explain each trend.
(a) Atomic radius
(b) Density
(c) Ionization energy
(d) Standard oxidation potential
20.20
Classify the following ligands as monodentate, bidentate, or tridentate. Which
can form chelate rings?
20.21
Draw the structure of the following complexes. What are the oxidation state,
coordination number, and coordination geometry of the metal in each?
(a) Na[Au(CN)2]
(b) [Co(NH3)5Br]SO4
(c) Pt(en)CL2
(d) (NH4)2[PtCL2(C2O4)2
20.22

Consider the following isomers of [Cr(NH3)2CL4] :
(a) Label the isomers as cis or trans.
(b) Which isomers are identical, and which are different?
(c) Do any of these isomers exist as enantiomers? Explain.
20.23
Consider the following ethylenediamine complexes:
(a) Which complexes are chiral, and which are achiral?
(b) Draw the enantiomer of each chiral complex.
(c) Which, if any, of the chiral complexes are enantiomers of one another?
20.24
Predict the crystal field energy-level diagram for a square pyramidal ML5
complex that has two ligands along the +x and +y axes but only one ligand
along the z axis. Your diagram should be intermediate between those for an
octahedral ML6 complex and a square planar ML4 complex.
20.25
Imagine two complexes, one tetrahedral and one square planar, in which the
central atom is bonded to four different ligands (shown here in four different
colors). Is either complex chiral? Explain.