Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Rb Rubidium | K Potassium |
|---|---|---|
| Atomic Number | 37 higher | 19 higher |
| Symbol | Rb different | K different |
| Name | Rubidium different | Potassium different |
| Atomic Mass | 85.468 higher | 39.0983 higher |
| Category | Alkali Metals same value | Alkali Metals same value |
| Period | 5 higher | 4 higher |
| Group | 1 same value | 1 same value |
| Block | s-Block same value | s-Block same value |
| Standard State | Solid same value | Solid same value |
| Electronegativity | 0.82 same value | 0.82 same value |
| Atomic Radius | 303 higher | 275 higher |
| Ionization Energy | 4.177 lower | 4.341 lower |
| Electron Affinity | 0.468 lower | 0.501 lower |
| Oxidation States | +1 same value | +1 same value |
| Melting Point | 312.46 K (39.31 °C) lower | 336.53 K (63.38 °C) lower |
| Boiling Point | 961 K (687.85 °C) lower | 1032 K (758.85 °C) lower |
| Density | 1.53 higher | 0.89 higher |
| Electron Configuration | [Kr]5s1 different | [Ar]4s1 different |
| Year Discovered | 1861 different | 1807 different |
higher lower
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