Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | He Helium | H Hydrogen |
|---|---|---|
| Atomic Number | 2 higher | 1 higher |
| Symbol | He different | H different |
| Name | Helium different | Hydrogen different |
| Atomic Mass | 4.0026 higher | 1.008 higher |
| Category | Noble Gases different | Reactive Nonmetals different |
| Period | 1 same value | 1 same value |
| Group | 18 higher | 1 higher |
| Block | p-Block different | s-Block different |
| Standard State | Gas same value | Gas same value |
| Electronegativity | — no data | 2.2 no data |
| Atomic Radius | 140 higher | 120 higher |
| Ionization Energy | 24.587 higher | 13.598 higher |
| Electron Affinity | — no data | 0.754 no data |
| Oxidation States | 0 different | +1, -1 different |
| Melting Point | 0.95 K (-272.2 °C) lower | 13.81 K (-259.34 °C) lower |
| Boiling Point | 4.22 K (-268.93 °C) lower | 20.28 K (-252.87 °C) lower |
| Density | 0.0002 higher | 0.0001 higher |
| Electron Configuration | 1s2 different | 1s1 different |
| Year Discovered | 1868 different | 1766 different |
higher lower
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