Calcium
| Basic Information | Crystal Structure | Isotope | Facts | Related Links |
| Symbol: | Ca |
| Atomic Number: | 20 |
| Atomic weight: | 40.08u |
| Melting Point: | 1112K |
| Boiling Point: | 1757K |
| Number of Protons/Electrons: | 20 |
| Number of Neutrons: | 20 |
| Classification: | Alkaline Earth Metal |
| Crystal Structure: | Face Centered Cubic |
| Density | 1.55g/mL |
| Color: | Silvery |
| Bonding radius: | 1.74A |
| Atomic radius: | 2.23A |
| Ionization Potential: | 6.113V |
| Electronegativity: | 1 |
| Heat of vaporization: | 153.6kJ/mol |
| Heat of fusion: | 8.54kJ/mol |
| Specific heat: | 0.63J/gK |
| Electron configuration: | [Ar]4s2 |
Crystal Structure
| Isotope | Half Life |
| Ca40 | Stable |
| Ca41 | 103000 years |
| Ca42 | Stable |
| Ca43 | Stable |
| Ca44 | Stable |
| Ca45 | 162.7 days |
| Ca46 | Stable |
| Ca47 | 4.5 days |
| Ca48 | Stable |
| Ca49 | 8.7 minutes |
| Date of Discovery: | 1808 |
| Discoverer: | Sir Humphrey Davy |
| Uses: | life forms for bones and shells |
| Obtained From: | chalk, limestone, marble. 3.5% of crust |