Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | O Oxygen | Se Selenium |
|---|---|---|
| Atomic Number | 8 lower | 34 lower |
| Symbol | O different | Se different |
| Name | Oxygen different | Selenium different |
| Atomic Mass | 15.999 lower | 78.97 lower |
| Category | Reactive Nonmetals same value | Reactive Nonmetals same value |
| Period | 2 lower | 4 lower |
| Group | 16 same value | 16 same value |
| Block | p-Block same value | p-Block same value |
| Standard State | Gas different | Solid different |
| Electronegativity | 3.44 higher | 2.55 higher |
| Atomic Radius | 152 lower | 190 lower |
| Ionization Energy | 13.618 higher | 9.752 higher |
| Electron Affinity | 1.461 lower | 2.021 lower |
| Oxidation States | -2 different | +6, +4, -2 different |
| Melting Point | 54.36 K (-218.79 °C) lower | 493.65 K (220.5 °C) lower |
| Boiling Point | 90.2 K (-182.95 °C) lower | 958 K (684.85 °C) lower |
| Density | 0.0014 lower | 4.809 lower |
| Electron Configuration | [He]2s2 2p4 different | [Ar]4s2 3d10 4p4 different |
| Year Discovered | 1774 different | 1817 different |
higher lower
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