Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Pr Praseodymium | Th Thorium |
|---|---|---|
| Atomic Number | 59 lower | 90 lower |
| Symbol | Pr different | Th different |
| Name | Praseodymium different | Thorium different |
| Atomic Mass | 140.9077 lower | 232.038 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 | 1.13 lower | 1.3 lower |
| Atomic Radius | 239 higher | 237 higher |
| Ionization Energy | 5.464 lower | 6.08 lower |
| Electron Affinity | — no data | — no data |
| Oxidation States | +3 different | +4 different |
| Melting Point | 1204 K (930.85 °C) lower | 2023 K (1749.85 °C) lower |
| Boiling Point | 3793 K (3519.85 °C) lower | 5061 K (4787.85 °C) lower |
| Density | 6.77 lower | 11.72 lower |
| Electron Configuration | [Xe]6s2 4f3 different | [Rn]7s2 6d2 different |
| Year Discovered | 1885 different | 1828 different |
higher lower
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