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