| Attribute | Europium × | Strontium × |
|---|---|---|
| Standard state | Solid | Solid |
| Electron configuration | [Xe]6s²4f⁷ | [Kr]5s² |
| Atomic mass (u) | 151.964 | 87.62 |
| Electronegativity (pauling scale) | - | 0.95 |
| Oxidation states |
|
|
| Ionization energy (eV) | 5.67 | 5.695 |
| Atomic radius (van der waals) (pm) | 233 | 249 |
| Boiling point (K) | 1802 | 1655 |
| Melting point (K) | 1095 | 1050 |
| Density (g/cm³) | 5.24 | 2.64 |
| Atomic number | 63 | 38 |
| Group name | Lanthanide | Alkaline earth metal |
| Symbol | Eu | Sr |
| Discovered (year) | 1901 | 1790 |