Atomic number 4 · alkaline earth · Atomic mass 9.0122 u
| Atomic Number | 4 |
| Atomic Mass | 9.0122 u |
| Category | alkaline earth / 碱土金属 |
| Group | 2 |
| Period | 2 |
| Block | S |
| Electron Configuration | [He] 2s² |
| Electronegativity (Pauling) | 1.57 |
| Phase at STP | Solid |
| Density | 1.848 g/cm³ |
| Year Discovered | 1798 |
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