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Francium, 87Fr| Francium |
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| Pronunciation | (Template:Respell) |
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| Mass number | [223] |
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| Francium in the periodic table |
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|
|
| Atomic number (Z) | 87 |
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| Group | group 1: H and alkali metals |
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| Period | period 7 |
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| Block | s-block |
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| Electron configuration | [Rn] 7s1 |
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| Electrons per shell | 2, 8, 18, 32, 18, 8, 1 |
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| Physical properties |
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| Phase at STP | solid |
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| Melting point | 300 K (27 °C, 81 °F) |
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| Boiling point | 950 K (677 °C, 1251 °F) |
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| Density (near r.t.) | 2.48 g/cm3 (estimated)[1] |
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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 |
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| Oxidation states | +1 (a strongly basic oxide) |
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| Electronegativity | Pauling scale: >0.79 |
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| Ionization energies | |
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| Covalent radius | 260 pm (extrapolated) |
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| Van der Waals radius | 348 pm (extrapolated) |
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| Other properties |
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| Natural occurrence | from decay |
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| Crystal structure | body-centered cubic (bcc) (extrapolated) |
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| Thermal conductivity | 15 W/(m·K) (extrapolated) |
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| Electrical resistivity | 3 µΩ·m (calculated) |
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| Magnetic ordering | Paramagnetic |
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| CAS Number | 7440-73-5 |
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| History |
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| Naming | after France, homeland of the discoverer |
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| Discovery and first isolation | Marguerite Perey (1939) |
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| Main isotopes of francium |
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|
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Category: Francium | references |
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References
These references will appear in the article, but this list appears only on this page.
- ↑ Lavrukhina, Avgusta Konstantinovna; Pozdnyakov, Aleksandr Aleksandrovich (1970). Analytical Chemistry of Technetium, Promethium, Astatine, and Francium. Translated by R. Kondor. Ann Arbor–Humphrey Science Publishers. p. 269. ISBN 978-0-250-39923-9.
- ↑ ISOLDE Collaboration, J. Phys. B 23, 3511 (1990) (PDF online)
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