Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Pm Promethium | Th Thorium |
|---|---|---|
| Atomic Number | 61 lower | 90 lower |
| Symbol | Pm different | Th different |
| Name | Promethium different | Thorium different |
| Atomic Mass | 144.9128 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 | — no data | 1.3 no data |
| Atomic Radius | 236 lower | 237 lower |
| Ionization Energy | 5.55 lower | 6.08 lower |
| Electron Affinity | — no data | — no data |
| Oxidation States | +3 different | +4 different |
| Melting Point | 1315 K (1041.85 °C) lower | 2023 K (1749.85 °C) lower |
| Boiling Point | 3273 K (2999.85 °C) lower | 5061 K (4787.85 °C) lower |
| Density | 7.26 lower | 11.72 lower |
| Electron Configuration | [Xe]6s2 4f5 different | [Rn]7s2 6d2 different |
| Year Discovered | 1945 different | 1828 different |
higher lower
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