Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Ac Actinium | Pm Promethium |
|---|---|---|
| Atomic Number | 89 higher | 61 higher |
| Symbol | Ac different | Pm different |
| Name | Actinium different | Promethium different |
| Atomic Mass | 227.0277 higher | 144.9128 higher |
| Category | Actinides different | Lanthanides different |
| Period | 7 higher | 6 higher |
| 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 | 1.1 no data | — no data |
| Atomic Radius | 260 higher | 236 higher |
| Ionization Energy | 5.17 lower | 5.55 lower |
| Electron Affinity | — no data | — no data |
| Oxidation States | +3 same value | +3 same value |
| Melting Point | 1324 K (1050.85 °C) higher | 1315 K (1041.85 °C) higher |
| Boiling Point | 3471 K (3197.85 °C) higher | 3273 K (2999.85 °C) higher |
| Density | 10.07 higher | 7.26 higher |
| Electron Configuration | [Rn]7s2 6d1 different | [Xe]6s2 4f5 different |
| Year Discovered | 1899 different | 1945 different |
higher lower
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