Calcium
Videonummer 11931428
| Sample of the element calcium (Ca) rotating. Calcium has the atomic number 20, and is a soft, reactive alkaline earth metal. Due to its reactivity it tarnishes rapidly on exposure to atmospheric moisture and oxygen. The dark grey colour of this sample is a layer of oxidised metal. It burns with a bright orange-red flame when heated in air. It has a melting point of 842 degrees Celsius. Its ions are vital for cellular function and its compounds are a major structural component of bones, shells and other animal structures. | |
| Lizenzart: | Lizenzpflichtig |
| Credit: | Science Photo Library |
| Modell-Rechte: | nicht erforderlich |
| Eigentums-Rechte: | nicht erforderlich |
| Länge: | 12 Sekunden |
| Seitenverhältnis: | 16:9 |
| Restrictions: | - |
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