31. It is common for early metals to adopt high coordination numbers ( more than 6 ) with compact ligands. 32. If the coordination number is not known, a typical coordination number for the atom can be used instead. 33. If the coordination number is not known, a typical coordination number for the atom can be used instead. 34. When the surrounding ligands are much smaller than the central atom, even higher coordination numbers may be possible. 35. The average sulfur coordination number is greater than two; sulfide glasses usually have coordination numbers less than two. 36. The average sulfur coordination number is greater than two; sulfide glasses usually have coordination numbers less than two. 37. Due to their large size, lanthanides, actinides, and early transition metals tend to have high coordination numbers . 38. A coordination number of 12 is found in a cubic close-packed or a hexagonal close-packed structure. 39. Typically, elements capable of variable coordination number and / or oxidation states tend to exhibit greater numbers of allotropic forms. 40. Like iron, ruthenium does not readily form oxoanions, and prefers to achieve high coordination numbers with hydroxide ions instead.
