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