Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Po Polonium | Se Selenium |
|---|---|---|
| Atomic Number | 84 higher | 34 higher |
| Symbol | Po different | Se different |
| Name | Polonium different | Selenium different |
| Atomic Mass | 208.9824 higher | 78.97 higher |
| Category | Metalloids different | Reactive Nonmetals different |
| Period | 6 higher | 4 higher |
| Group | 16 same value | 16 same value |
| Block | p-Block same value | p-Block same value |
| Standard State | Solid same value | Solid same value |
| Electronegativity | 2 lower | 2.55 lower |
| Atomic Radius | 197 higher | 190 higher |
| Ionization Energy | 8.417 lower | 9.752 lower |
| Electron Affinity | 1.9 lower | 2.021 lower |
| Oxidation States | +4, +2 different | +6, +4, -2 different |
| Melting Point | 527 K (253.85 °C) higher | 493.65 K (220.5 °C) higher |
| Boiling Point | 1235 K (961.85 °C) higher | 958 K (684.85 °C) higher |
| Density | 9.32 higher | 4.809 higher |
| Electron Configuration | [Xe]6s2 4f14 5d10 6p4 different | [Ar]4s2 3d10 4p4 different |
| Year Discovered | 1898 different | 1817 different |
higher lower
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