Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | K Potassium | Se Selenium |
|---|---|---|
| Atomic Number | 19 lower | 34 lower |
| Symbol | K different | Se different |
| Name | Potassium different | Selenium different |
| Atomic Mass | 39.0983 lower | 78.97 lower |
| Category | Alkali Metals different | Reactive Nonmetals different |
| Period | 4 same value | 4 same value |
| Group | 1 lower | 16 lower |
| Block | s-Block different | p-Block different |
| Standard State | Solid same value | Solid same value |
| Electronegativity | 0.82 lower | 2.55 lower |
| Atomic Radius | 275 higher | 190 higher |
| Ionization Energy | 4.341 lower | 9.752 lower |
| Electron Affinity | 0.501 lower | 2.021 lower |
| Oxidation States | +1 different | +6, +4, -2 different |
| Melting Point | 336.53 K (63.38 °C) lower | 493.65 K (220.5 °C) lower |
| Boiling Point | 1032 K (758.85 °C) higher | 958 K (684.85 °C) higher |
| Density | 0.89 lower | 4.809 lower |
| Electron Configuration | [Ar]4s1 different | [Ar]4s2 3d10 4p4 different |
| Year Discovered | 1807 different | 1817 different |
higher lower
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