Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Pr Praseodymium | Pm Promethium |
|---|---|---|
| Atomic Number | 59 lower | 61 lower |
| Symbol | Pr different | Pm different |
| Name | Praseodymium different | Promethium different |
| Atomic Mass | 140.9077 lower | 144.9128 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 | 1.13 no data | — no data |
| Atomic Radius | 239 higher | 236 higher |
| Ionization Energy | 5.464 lower | 5.55 lower |
| Electron Affinity | — no data | — no data |
| Oxidation States | +3 same value | +3 same value |
| Melting Point | 1204 K (930.85 °C) lower | 1315 K (1041.85 °C) lower |
| Boiling Point | 3793 K (3519.85 °C) higher | 3273 K (2999.85 °C) higher |
| Density | 6.77 lower | 7.26 lower |
| Electron Configuration | [Xe]6s2 4f3 different | [Xe]6s2 4f5 different |
| Year Discovered | 1885 different | 1945 different |
higher lower
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