Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | H Hydrogen | Fr Francium |
|---|---|---|
| Atomic Number | 1 lower | 87 lower |
| Symbol | H different | Fr different |
| Name | Hydrogen different | Francium different |
| Atomic Mass | 1.008 lower | 223.0197 lower |
| Category | Reactive Nonmetals different | Alkali Metals different |
| Period | 1 lower | 7 lower |
| Group | 1 same value | 1 same value |
| Block | s-Block same value | s-Block same value |
| Standard State | Gas different | Solid different |
| Electronegativity | 2.2 higher | 0.7 higher |
| Atomic Radius | 120 lower | 348 lower |
| Ionization Energy | 13.598 higher | 3.9 higher |
| Electron Affinity | 0.754 higher | 0.47 higher |
| Oxidation States | +1, -1 different | +1 different |
| Melting Point | 13.81 K (-259.34 °C) lower | 300 K (26.85 °C) lower |
| Boiling Point | 20.28 K (-252.87 °C) no data | — no data |
| Density | 0.0001 no data | — no data |
| Electron Configuration | 1s1 different | [Rn]7s1 different |
| Year Discovered | 1766 different | 1939 different |
higher lower
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