2.8: Solutions to Electron Counting Problems

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Solutions to Selected Problems

Problem 4.

a) Metal valence count: 9

Metal with charge: 6

Donated by ligands: 6 x 2 = 12

Total: 18

b) Metal valence count: 8

Metal with charge: 5

Donated by ligands: 6 x 2 = 12

Total: 17

c) Metal valence count: 9

Metal with charge: 7

Donated by ligands: 6 x 2 = 12

Total: 19

d) Metal valence count: 7

Metal with charge: 0

Donated by ligands: 4 x 4 = 16

Total: 16

e) Metal valence count: 8

Metal with charge: 8

Donated by ligands: 5 x 2 = 10

Total: 18

f) Metal valence count: 10

Metal with charge: 6

Donated by ligands: 6 x 2 = 12

Total: 18

g) Metal valence count: 6

Metal with charge: 6

Donated by ligands: 6 x 2 = 12

Total: 18

h) Metal valence count: 6

Metal with charge: 0

Donated by ligands: 4 x 4 = 16

Total: 16

i) Metal valence count: 9

Metal with charge: 8

Donated by ligands: 4 x 2 = 8

Total: 16

j) Metal valence count: 8

Metal with charge: 4

Donated by ligands: 3 x 4 = 12

Total: 16

k) Metal valence count: 9

Metal with charge: 7

Donated by ligands: 4 x 2 = 8

Total: 15

Problem 5.

a) 6 b) 8 c) 5 d) 5 e) 10 f) 1 g) 10 h) 12 i) 2 j) 9 k) 4

a) Metal valence count: 5

Metal with charge: 0

Donated by ligands: 5 x 2 = 10

Total: 10

b) Metal valence count: 8

Metal with charge: 5

Donated by ligands: 3 x 2 = 6

Total: 11

c) Metal valence count: 6

Metal with charge: 0

Donated by ligands: 6 x 2 = 12

Total: 12

Problem 8.

a) PF₃ (104 vs 87⁰)

b) PMe₃ (118 vs 87⁰)

c) PtBu₃ (182 vs 118⁰)

d) PtBu₃ (182 vs 145⁰)

Contributors

Chris P Schaller, Ph.D., (College of Saint Benedict / Saint John's University)