Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Ar Argon | He Helium |
|---|---|---|
| Atomic Number | 18 higher | 2 higher |
| Symbol | Ar different | He different |
| Name | Argon different | Helium different |
| Atomic Mass | 39.9 higher | 4.0026 higher |
| Category | Noble Gases same value | Noble Gases same value |
| Period | 3 higher | 1 higher |
| Group | 18 same value | 18 same value |
| Block | p-Block same value | p-Block same value |
| Standard State | Gas same value | Gas same value |
| Electronegativity | — no data | — no data |
| Atomic Radius | 188 higher | 140 higher |
| Ionization Energy | 15.76 lower | 24.587 lower |
| Electron Affinity | — no data | — no data |
| Oxidation States | 0 same value | 0 same value |
| Melting Point | 83.8 K (-189.35 °C) higher | 0.95 K (-272.2 °C) higher |
| Boiling Point | 87.3 K (-185.85 °C) higher | 4.22 K (-268.93 °C) higher |
| Density | 0.0018 higher | 0.0002 higher |
| Electron Configuration | [Ne]3s2 3p6 different | 1s2 different |
| Year Discovered | 1894 different | 1868 different |
higher lower
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