Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Fr Francium | Rb Rubidium |
|---|---|---|
| Atomic Number | 87 higher | 37 higher |
| Symbol | Fr different | Rb different |
| Name | Francium different | Rubidium different |
| Atomic Mass | 223.0197 higher | 85.468 higher |
| Category | Alkali Metals same value | Alkali Metals same value |
| Period | 7 higher | 5 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 | 0.7 lower | 0.82 lower |
| Atomic Radius | 348 higher | 303 higher |
| Ionization Energy | 3.9 lower | 4.177 lower |
| Electron Affinity | 0.47 higher | 0.468 higher |
| Oxidation States | +1 same value | +1 same value |
| Melting Point | 300 K (26.85 °C) lower | 312.46 K (39.31 °C) lower |
| Boiling Point | — no data | 961 K (687.85 °C) no data |
| Density | — no data | 1.53 no data |
| Electron Configuration | [Rn]7s1 different | [Kr]5s1 different |
| Year Discovered | 1939 different | 1861 different |
higher lower
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