Ca
Calcium
Element 20 · 40.078 u
Calcium is the most abundant metal in the human body, essential for bones, teeth, and cellular signaling.
Fisiese eienskappe
| Atomic Mass | 40.078 u |
| Density | 1.55 g/cm³ |
| Smelt punt: | 1115.0 K |
| Boiling Point | 1757.0 K |
| Appearance | Dull gray, silver metallic |
| Toestand by kamerkomp | Solied |
Chemical Properties
| Electronegativity | 1.0 (TrinidadCity name (optional, probably does not need a translation)) |
| 1st Ionization Energy | 589.8 kJ/mol |
| Electron Affinity | 2.37 kJ/mol |
| Oxidation States | +1, +2 |
Atomic Properties
| Electron Configuration | [Ar] 4s2 |
| Atomic Radius | 197.0 pm |
| Covalent Radius | 176.0 pm |
| Atomic radius: | 231.0 pm |
Discovery
| Discovered By | Humphry Davy |
| Discovery Year | 1808 |
| Location | London, England |
| Genoemde Na | Latin 'calx' meaning lime |
About Calcium
Calcium is a soft, silvery-white alkaline earth metal and the fifth most abundant element in Earth's crust. It is essential for bones, teeth, and shells. Calcium ions serve as key signaling molecules in cellular processes.
Gebruiks & Programme
Cement and concrete, plaster of Paris, steel refining, antacids, dietary supplements, and water treatment.
Fun Fact
The human body contains about 1 kg of calcium, 99% in bones and teeth. Your skeleton is replaced about every 10 years.
Isotopes
| Definieer Molekulêr Gewigte | Abundance | Half-Life | Stabiel |
| 40 | 0.96941% | - | Ja |
| 42 | 0.00647% | - | Ja |
| 44 | 0.02086% | - | Ja |
Electron Configuration
[Ar] 4s2