Potassi
Lo potassi es un element quimic, de simbòl K (d'etimologia aràbia al-kali) puèi del latin kalium) e de numèro atomic 19.
Es un metal alcalin mòl, d'aspècte blanc metallic (leugièrament blavàs) que se tròba naturalament ligat a d'autres elements dins l'aiga de mar e dins de minerals nombroses. S'oxida rapidament al contacte de l'aire e reagís violentament amb l'aiga. Sembla quimicament lo sòdi.
Isotòps
Se coneis l'existéncia de 24 isotòps del potassi :
| No. | simbòl del nucleïd |
Z(p) | N(n) | massa de l'isotòp (u) |
mièjavida | spin nuclear |
composicion isotopica (fraccion molara) |
|---|---|---|---|---|---|---|---|
| energia d'excitacion | |||||||
| 1 | 32K | 19 | 13 | 32.02192(54)# | 1+# | ||
| 32mK | 950(100)# keV | ? | 4+# | ||||
| 2 | 33K | 19 | 14 | 33.00726(21)# | <25 ns | (3/2+)# | |
| 3 | 34K | 19 | 15 | 33.99841(32)# | <40 ns | 1+# | |
| 4 | 35K | 19 | 16 | 34.988010(21) | 178(8) ms | 3/2+ | |
| 5 | 36K | 19 | 17 | 35.981292(8) | 342(2) ms | 2+ | |
| 6 | 37K | 19 | 18 | 36.97337589(10) | 1.226(7) s | 3/2+ | |
| 7 | 38K | 19 | 19 | 37.9690812(5) | 7.636(18) min | 3+ | |
| 38m1K | 130.50(28) keV | 924.2(3) ms | 0+ | ||||
| 38m2K | 3458.0(2) keV | 21.98(11) µs | (7+),(5+) | ||||
| 8 | 39K | 19 | 20 | 38.96370668(20) | ESTABLE | 3/2+ | 0.932581(44) |
| 9 | 40K | 19 | 21 | 39.96399848(21) | 1.248(3)E+9 a | 4- | 0.000117(1) |
| 40mK | 1643.639(11) keV | 336(12) ns | 0+ | ||||
| 10 | 41K | 19 | 22 | 40.96182576(21) | ESTABLE | 3/2+ | 0.067302(44) |
| 11 | 42K | 19 | 23 | 41.96240281(24) | 12.360(12) h | 2- | |
| 12 | 43K | 19 | 24 | 42.960716(10) | 22.3(1) h | 3/2+ | |
| 13 | 44K | 19 | 25 | 43.96156(4) | 22.13(19) min | 2- | |
| 14 | 45K | 19 | 26 | 44.960699(11) | 17.3(6) min | 3/2+ | |
| 15 | 46K | 19 | 27 | 45.961977(17) | 105(10) s | 2(-) | |
| 16 | 47K | 19 | 28 | 46.961678(9) | 17.50(24) s | 1/2+ | |
| 17 | 48K | 19 | 29 | 47.965514(26) | 6.8(2) s | (2-) | |
| 18 | 49K | 19 | 30 | 48.96745(8) | 1.26(5) s | (3/2+) | |
| 19 | 50K | 19 | 31 | 49.97278(30) | 472(4) ms | (0-,1,2-) | |
| 20 | 51K | 19 | 32 | 50.97638(54)# | 365(5) ms | 3/2+# | |
| 21 | 52K | 19 | 33 | 51.98261(75)# | 105(5) ms | (2-)# | |
| 22 | 53K | 19 | 34 | 52.98712(75)# | 30(5) ms | (3/2+)# | |
| 23 | 54K | 19 | 35 | 53.99420(97)# | 10(5) ms | 2-# | |
| 24 | 55K | 19 | 36 | 54.99971(107)# | 3# ms | 3/2+# | |
Las valors marcadas d'un # son de valors de prediccion.
Las valors de spin de febla certitud e mai las incertituds
per las darrièras chifras son indicadas entre parentèsis.
Content Disclaimer
Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.
- The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
- There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
- It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
- Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
- Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.