Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Pm Promethium | La Lanthanum |
|---|---|---|
| Atomic Number | 61 higher | 57 higher |
| Symbol | Pm different | La different |
| Name | Promethium different | Lanthanum different |
| Atomic Mass | 144.9128 higher | 138.9055 higher |
| 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 | — no data | 1.1 no data |
| Atomic Radius | 236 lower | 240 lower |
| Ionization Energy | 5.55 lower | 5.577 lower |
| Electron Affinity | — no data | 0.5 no data |
| Oxidation States | +3 same value | +3 same value |
| Melting Point | 1315 K (1041.85 °C) higher | 1191 K (917.85 °C) higher |
| Boiling Point | 3273 K (2999.85 °C) lower | 3737 K (3463.85 °C) lower |
| Density | 7.26 higher | 6.15 higher |
| Electron Configuration | [Xe]6s2 4f5 different | [Xe]6s2 5d1 different |
| Year Discovered | 1945 different | 1839 different |
higher lower
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