Multiple Choice
Lead (Pb) crystallizes in a face-centered cubic (fcc) lattice. What is the coordination number for Pb in this structure?
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24. Transition Metals and Coordination Compounds
Coordination Numbers & Geometry
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Correctly label all the components of the coordination complex and its coordination number: Na2[SnCl6].
A
Sn2+: metal cation
Cl–: ligands
Na+: counterions
Cl–: ligands
Na+: counterions
B
Sn2+: metal cation
Cl–: counterions
Na+: ligands
Cl–: counterions
Na+: ligands
C
Sn2+: counterion
Cl–: ligands
Na+: metal cation
Cl–: ligands
Na+: metal cation
D
Sn4+: metal cation
Cl–: ligands
Na+: counterions
Cl–: ligands
Na+: counterions
E
Sn4+: metal cation
Cl–: counterion
Na+: ligands
Cl–: counterion
Na+: ligands
F
Sn4+: counterion
Cl–: ligands
Na+: metal cation
Cl–: ligands
Na+: metal cation
Verified step by step guidance1
Identify the central metal ion in the coordination complex. In Na2[SnCl6], the central metal ion is Sn, which is tin.
Determine the oxidation state of the central metal ion. Since the complex is [SnCl6]2-, and each Cl- ligand has a -1 charge, the total charge from the ligands is -6. To balance this with the 2- charge of the complex, Sn must have a +4 oxidation state, making it Sn4+.
Label the ligands in the coordination complex. In [SnCl6]2-, the ligands are Cl- ions, which are negatively charged and coordinate to the central metal ion.
Identify the counterions in the compound. The counterions are the ions outside the coordination sphere that balance the charge of the complex. In Na2[SnCl6], the Na+ ions are the counterions, balancing the 2- charge of the [SnCl6]2- complex.
Determine the coordination number of the complex. The coordination number is the number of ligand donor atoms bonded to the central metal ion. In [SnCl6]2-, there are six Cl- ligands, so the coordination number is 6.
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