Ang pransyo (Iningles francium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Fr ug kaiphan nga atomik 87. Ang pransyo mao ang puthaw.
Quick Facts Francium, Panagway ...
| Francium |
|---|
87Fr |
|
|
| Panagway |
| Unknown, but probably metallic |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan |
francium, Fr, 87 |
| Paglitok |
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-see-əm]] |
| Kategoriyang elemento |
puthaw |
| Group, period, block |
1, 7, s |
| Gibug-aton sa atomo |
(223) |
| Kontorno sa elektron |
[Rn] 7s1
2, 8, 18, 32, 18, 8, 1
 Electron shells of francium (2, 8, 18, 32, 18, 8, 1) |
| History |
| Pagkadiskobre |
Marguerite Perey (1939) |
| First isolation |
Marguerite Perey (1939) |
| Physical properties |
| Phase |
magahi presumably |
| Density (near r.t.) |
? 1.87 (extrapolated) g·cm−3 |
| Melting point |
? 300 K, ? 27 °C, ? 80 °F |
| Boiling point |
? 950 K, ? 677 °C, ? 1250 °F |
| Heat of fusion |
ca. 2 kJ·mol−1 |
| Heat of vaporization |
ca. 65 kJ·mol−1 |
| Vapor pressure (extrapolated) |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
404 |
454 |
519 |
608 |
738 |
946 |
|
| Atomic properties |
| Oxidation states |
1 (strongly basic oxide) |
| Electronegativity |
0.7 (Pauling scale) |
| Ionization energies |
1st: 380 kJ·mol−1 |
| Covalent radius |
260 (extrapolated) pm |
| Van der Waals radius |
348 (extrapolated) pm |
| Miscellanea |
| Crystal structure |
cubic body-centered (extrapolated)
|
| Magnetic ordering |
Paramagnetic |
| Electrical resistivity |
3 µ (calculated)Ω·m |
| Thermal conductivity |
15 (extrapolated) W·m−1·K−1 |
| CAS registry number |
7440-73-5 |
| Most stable isotopes |
| Main article: Isotopes of francium |
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
|---|
| 221Fr |
trace |
4.8 min |
α |
6.457 |
217At |
| 222Fr |
syn |
14.2 min |
β– |
2.033 |
222Ra |
| 223Fr |
trace |
22.00 min |
β– |
1.149 |
223Ra |
| α |
5.430 |
219At |
|
| · r |
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