| Thus carbon occurs as the diamond, and as charcoal and plumbago, and is therefore regarded as a substance subject to allotropy. |
| Elements exhibiting allotropy include tin, carbon, sulfur, phosphorus, and oxygen. |
| Before leaving this phase of inorganic chemistry, we may mention other historical examples of allotropy. |
| With the exception of nitrogen, all group V elements show allotropy. |
| Important for the uniqueness of steel is the allotropy of iron that is, its existence in two crystalline forms. |
| An example of allotropy is carbon, which can exist as diamond, graphite, and amorphous carbon. |
