Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | K Potassium | Ca Calcium |
|---|---|---|
| Atomic Number | 19 lower | 20 lower |
| Symbol | K different | Ca different |
| Name | Potassium different | Calcium different |
| Atomic Mass | 39.0983 lower | 40.08 lower |
| Category | Alkali Metals different | Alkaline Earth Metals different |
| Period | 4 same value | 4 same value |
| Group | 1 lower | 2 lower |
| Block | s-Block same value | s-Block same value |
| Standard State | Solid same value | Solid same value |
| Electronegativity | 0.82 lower | 1 lower |
| Atomic Radius | 275 higher | 231 higher |
| Ionization Energy | 4.341 lower | 6.113 lower |
| Electron Affinity | 0.501 no data | — no data |
| Oxidation States | +1 different | +2 different |
| Melting Point | 336.53 K (63.38 °C) lower | 1115 K (841.85 °C) lower |
| Boiling Point | 1032 K (758.85 °C) lower | 1757 K (1483.85 °C) lower |
| Density | 0.89 lower | 1.54 lower |
| Electron Configuration | [Ar]4s1 different | [Ar]4s2 different |
| Year Discovered | 1807 different | Ancient different |
higher lower
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