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