| A metallic chemical element with a high resistance to atmospheric corrosion. |
| My project dealt with different crystalline forms of the chemical element selenium. |
| Today, the name phosphorus is used for the chemical element only, whereas certain microcrystalline luminescent materials are called phosphors. |
| It was not until 1807, however, that Sir Humphrey Davy identified boron as a chemical element. |
| Plasma is a special state of a very hot chemical element whose atoms are completely stripped of their electrons. |
| Isotopes of a chemical element are atoms having the same number of protons but different numbers of neutrons in the nucleus. |
