Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | La Lanthanum | Sm Samarium |
|---|---|---|
| Atomic Number | 57 lower | 62 lower |
| Symbol | La different | Sm different |
| Name | Lanthanum different | Samarium different |
| Atomic Mass | 138.9055 lower | 150.4 lower |
| Category | Lanthanides same value | Lanthanides same value |
| Period | 6 same value | 6 same value |
| Group | 3 same value | 3 same value |
| Block | f-Block same value | f-Block same value |
| Standard State | Solid same value | Solid same value |
| Electronegativity | 1.1 lower | 1.17 lower |
| Atomic Radius | 240 higher | 229 higher |
| Ionization Energy | 5.577 lower | 5.644 lower |
| Electron Affinity | 0.5 no data | — no data |
| Oxidation States | +3 different | +3, +2 different |
| Melting Point | 1191 K (917.85 °C) lower | 1347 K (1073.85 °C) lower |
| Boiling Point | 3737 K (3463.85 °C) higher | 2067 K (1793.85 °C) higher |
| Density | 6.15 lower | 7.52 lower |
| Electron Configuration | [Xe]6s2 5d1 different | [Xe]6s2 4f6 different |
| Year Discovered | 1839 different | 1879 different |
higher lower
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