Difference between revisions of "Potassium"
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| − | + | ==External Links== | |
| + | *[http://lunar.arc.nasa.gov/results/gamres.htm Lunar Prospector: Gamma Ray Spectrometer Results] | ||
Revision as of 11:54, 14 February 2007
| Potassium | |
|---|---|
| K | |
| In situ availability: | trace |
| Necessity: | essential |
| Atomic number: | 19 |
| Atomic mass: | 39.0983 |
| group: | 1 |
| period: | 4 |
| normal phase: | Solid |
| series: | Alkali metals |
| density: | 0.89 g/cm3 |
| melting point: | 336.53K, 63.38°C, 146.08°F |
| boiling point: | 1032K, 759°C, 1398°F |
| N/A ← Na → Mg | |
| Ar ← K → Ca | |
| N/A ← Rb → Sr | |
| Atomic radius (pm): | 220 |
| Bohr radius (pm): | 243 |
| Covalent radius (pm): | 196 |
| Van der Waals radius (pm): | 275 |
| ionic radius (pm): | (+1) 151 |
| 1st ion potential (eV): | 4.34 |
| Electron Configuration | |
| 1s2 2s2 2p6 3s2 3p6 4s1 | |
| Electrons Per Shell | |
| 2, 8, 8, 1 | |
| Electronegativity: | 0.82 |
| Electron Affinity: | 0.5 |
| Oxidation states: | 1 |
| Magnetism: | ? |
| Crystal structure: | Body centered cubic |
Potassium is a Alkali metal in group 1.
It has a Body centered cubic crystalline structure.
This element has two stable isotopes: 39 and 41.
External Links
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