| The chemical element iodine is a major component of thyroid hormones. |
| Today, the name phosphorus is used for the chemical element only, whereas certain microcrystalline luminescent materials are called phosphors. |
| From the perspective of Newtonian essentialism, all samples of a chemical element are identical and, as modern physics assumes, so are nuclear particles. |
| It was not until 1807, however, that Sir Humphrey Davy identified boron as a chemical element. |
| Isotopes of a chemical element are atoms having the same number of protons but different numbers of neutrons in the nucleus. |
| A metallic chemical element with a high resistance to atmospheric corrosion. |
