Ca
Calcium
Element 20 · Alkaline earth metal · Period 4, Group 2
Solid · Discovered Ancient
Atomic Properties
| Atomic Number | 20 |
| Atomic Mass | 40.08u |
| Electron Configuration | [Ar]4s2 |
| Electronegativity | 1Pauling |
| Atomic Radius | 231pm |
| Ionization Energy | 6.113eV |
| Oxidation States | +2 |
Physical Properties
| Standard State | Solid |
| Melting Point | 1115K |
| Boiling Point | 1757K |
| Density | 1.54g/cm³ |
| Group Block | Alkaline earth metal |
| Year Discovered | Ancient |