Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | La Lanthanum | Ac Actinium |
|---|---|---|
| Atomic Number | 57 lower | 89 lower |
| Symbol | La different | Ac different |
| Name | Lanthanum different | Actinium different |
| Atomic Mass | 138.9055 lower | 227.0277 lower |
| Category | Lanthanides different | Actinides different |
| Period | 6 lower | 7 lower |
| 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 same value | 1.1 same value |
| Atomic Radius | 240 lower | 260 lower |
| Ionization Energy | 5.577 higher | 5.17 higher |
| Electron Affinity | 0.5 no data | — no data |
| Oxidation States | +3 same value | +3 same value |
| Melting Point | 1191 K (917.85 °C) lower | 1324 K (1050.85 °C) lower |
| Boiling Point | 3737 K (3463.85 °C) higher | 3471 K (3197.85 °C) higher |
| Density | 6.15 lower | 10.07 lower |
| Electron Configuration | [Xe]6s2 5d1 different | [Rn]7s2 6d1 different |
| Year Discovered | 1839 different | 1899 different |
higher lower
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