Franciumo
87
Fr
Grupo
1
Perio
7
Bloko
s
Protonoj
Elektronoj
Neŭtronoj
87
87
136
Ĝeneralaj Propraĵoj
Atoma Nombro
87
Atommaso
[223]
Amasa Nombro
223
Kategorio
Alkalaj metaloj
Koloro
Arĝento
Radioaktiva
Jes
Francium was named after France
Kristala Strukturo
Neniu
Historio
Francium was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris, France.
It was discovered when she was researching the radioactive decay of actinium-227.
Marguerite Perey discovered that francium-223 is made naturally when actinium-227 emits an alpha-particle.
It was discovered when she was researching the radioactive decay of actinium-227.
Marguerite Perey discovered that francium-223 is made naturally when actinium-227 emits an alpha-particle.
Elektronoj per ŝelo
2, 8, 18, 32, 18, 8, 1
Elektrona Agordo
[Rn] 7s1
Francium was the last element discovered in nature, rather than by synthesis
Fizikaj Propraĵoj
Fazo
Solido
Denso
1,87 g/cm3
Fandpunkto
296,15 K | 23 °C | 73,4 °F
Bolpunkto
950,15 K | 677 °C | 1250,6 °F
Varmo de Fuzio
2 kJ/mol
Varmo de Vaporiĝo
65 kJ/mol
Specifa Varmo Kapacito
-
Krusta Abundo
Neniu
Universa Abundo
Neniu
CAS Nombro
7440-73-5
PubChem Kunmetita Identiga Nombro
Neniu
Atomaj Propraĵoj
Atoma Radiuso
260 pm
Kovalenta Radiuso
348 pm
Elektronegativeco
0,7 (Pauling-skalo)
Potencialo de jonigo
4,0727 eV
Atoma Volumo
71,07 cm3/mol
Termika Kondukto
0,15 W/cm·K
Oksidaj Ŝtatoj
1
Aplikoj
Due to its instability and rarity, there are no commercial applications for francium.
It has been used for research purposes in the fields of biology and of atomic structure.
Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical.
It has been used for research purposes in the fields of biology and of atomic structure.
Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical.
Francium is highly radioactive
Izotopoj
Stabilaj Izotopoj
-Malstabilaj Isotopoj
199Fr, 200Fr, 201Fr, 202Fr, 203Fr, 204Fr, 205Fr, 206Fr, 207Fr, 208Fr, 209Fr, 210Fr, 211Fr, 212Fr, 213Fr, 214Fr, 215Fr, 216Fr, 217Fr, 218Fr, 219Fr, 220Fr, 221Fr, 222Fr, 223Fr, 224Fr, 225Fr, 226Fr, 227Fr, 228Fr, 229Fr, 230Fr, 231Fr, 232Fr