Potassium
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| Potassium |
|
19K
|
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|
| Ìhànsójú |
silvery gray
 |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
potassium, K, 19 |
| Ẹ̀ka ẹ́límẹ̀nti |
alkali metal |
| Ẹgbẹ́, àsìkò, àdìpò |
1, 4, s |
| Ìwúwo átọ́mù |
39.0983(1) |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Ar] 4s1
2, 8, 8, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
0.89 g·cm−3 |
| Liquid density at m.p. |
0.828 g·cm−3 |
| Melting point |
336.53 K, 63.38 °C, 146.08 °F |
| Boiling point |
1032 K, 759 °C, 1398 °F |
| Triple point |
336.35 K (63°C), kPa |
| Heat of fusion |
2.33 kJ·mol−1 |
| Heat of vaporization |
76.9 kJ·mol−1 |
| Molar heat capacity |
29.6 J·mol−1·K−1 |
| Atomic properties |
| Oxidation states |
1
(strongly basic oxide) |
| Electronegativity |
0.82 (Pauling scale) |
Ionization energies
(more) |
1st: 418.8 kJ·mol−1 |
| 2nd: 3052 kJ·mol−1 |
| 3rd: 4420 kJ·mol−1 |
| Atomic radius |
227 pm |
| Covalent radius |
203±12 pm |
| Van der Waals radius |
275 pm |
| Miscellanea |
| Crystal structure |
body-centered cubic
|
| Magnetic ordering |
paramagnetic |
| Thermal conductivity |
102.5 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 83.3 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 2000 m·s−1 |
| Young's modulus |
3.53 GPa |
| Shear modulus |
1.3 GPa |
| Bulk modulus |
3.1 GPa |
| Mohs hardness |
0.4 |
| Brinell hardness |
0.363 MPa |
| CAS registry number |
7440-09-7 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù potassium |
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· r |
