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