Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Pm Promethium | Ce Cerium |
|---|---|---|
| Atomic Number | 61 higher | 58 higher |
| Symbol | Pm different | Ce different |
| Name | Promethium different | Cerium different |
| Atomic Mass | 144.9128 higher | 140.116 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 | 1.12 no data |
| Atomic Radius | 236 higher | 235 higher |
| Ionization Energy | 5.55 higher | 5.539 higher |
| Electron Affinity | — no data | 0.5 no data |
| Oxidation States | +3 different | +4, +3 different |
| Melting Point | 1315 K (1041.85 °C) higher | 1071 K (797.85 °C) higher |
| Boiling Point | 3273 K (2999.85 °C) lower | 3697 K (3423.85 °C) lower |
| Density | 7.26 higher | 6.77 higher |
| Electron Configuration | [Xe]6s2 4f5 different | [Xe]6s2 4f1 5d1 different |
| Year Discovered | 1945 different | 1803 different |
higher lower
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