Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Sr Strontium | Rb Rubidium |
|---|---|---|
| Atomic Number | 38 higher | 37 higher |
| Symbol | Sr different | Rb different |
| Name | Strontium different | Rubidium different |
| Atomic Mass | 87.62 higher | 85.468 higher |
| Category | Alkaline Earth Metals different | Alkali Metals different |
| Period | 5 same value | 5 same value |
| Group | 2 higher | 1 higher |
| Block | s-Block same value | s-Block same value |
| Standard State | Solid same value | Solid same value |
| Electronegativity | 0.95 higher | 0.82 higher |
| Atomic Radius | 249 lower | 303 lower |
| Ionization Energy | 5.695 higher | 4.177 higher |
| Electron Affinity | — no data | 0.468 no data |
| Oxidation States | +2 different | +1 different |
| Melting Point | 1050 K (776.85 °C) higher | 312.46 K (39.31 °C) higher |
| Boiling Point | 1655 K (1381.85 °C) higher | 961 K (687.85 °C) higher |
| Density | 2.64 higher | 1.53 higher |
| Electron Configuration | [Kr]5s2 different | [Kr]5s1 different |
| Year Discovered | 1790 different | 1861 different |
higher lower
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