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