Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Rb Rubidium | Cs Cesium |
|---|---|---|
| Atomic Number | 37 lower | 55 lower |
| Symbol | Rb different | Cs different |
| Name | Rubidium different | Cesium different |
| Atomic Mass | 85.468 lower | 132.9055 lower |
| Category | Alkali Metals same value | Alkali Metals same value |
| Period | 5 lower | 6 lower |
| 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 higher | 0.79 higher |
| Atomic Radius | 303 lower | 343 lower |
| Ionization Energy | 4.177 higher | 3.894 higher |
| Electron Affinity | 0.468 lower | 0.472 lower |
| Oxidation States | +1 same value | +1 same value |
| Melting Point | 312.46 K (39.31 °C) higher | 301.59 K (28.44 °C) higher |
| Boiling Point | 961 K (687.85 °C) higher | 944 K (670.85 °C) higher |
| Density | 1.53 lower | 1.93 lower |
| Electron Configuration | [Kr]5s1 different | [Xe]6s1 different |
| Year Discovered | 1861 different | 1860 different |
higher lower
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