Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Se Selenium | Ca Calcium |
|---|---|---|
| Atomic Number | 34 higher | 20 higher |
| Symbol | Se different | Ca different |
| Name | Selenium different | Calcium different |
| Atomic Mass | 78.97 higher | 40.08 higher |
| Category | Reactive Nonmetals different | Alkaline Earth Metals different |
| Period | 4 same value | 4 same value |
| Group | 16 higher | 2 higher |
| Block | p-Block different | s-Block different |
| Standard State | Solid same value | Solid same value |
| Electronegativity | 2.55 higher | 1 higher |
| Atomic Radius | 190 lower | 231 lower |
| Ionization Energy | 9.752 higher | 6.113 higher |
| Electron Affinity | 2.021 no data | — no data |
| Oxidation States | +6, +4, -2 different | +2 different |
| Melting Point | 493.65 K (220.5 °C) lower | 1115 K (841.85 °C) lower |
| Boiling Point | 958 K (684.85 °C) lower | 1757 K (1483.85 °C) lower |
| Density | 4.809 higher | 1.54 higher |
| Electron Configuration | [Ar]4s2 3d10 4p4 different | [Ar]4s2 different |
| Year Discovered | 1817 different | Ancient different |
higher lower
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