Frankium
87
Fr
Groep
1
Periode
7
Blok
s
Protrone
Elektrone
Neutrone
87
87
136
Algemene Eienskappe
Atoom Nommer
87
Atoommassa
[223]
Massa Nommer
223
Kategorie
Alkalimetale
Kleur
Silver
Radioaktief
Ja
Francium was named after France
Kristalstruktuur
n/a
Geskiendenis
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.
Elektrone per skil
2, 8, 18, 32, 18, 8, 1
Elektronkonfigurasie
[Rn] 7s1
Francium was the last element discovered in nature, rather than by synthesis
Fisiese Eienskappe
Fase
Soliede
Digtheid
1,87 g/cm3
Smeltpunt
296,15 K | 23 °C | 73,4 °F
Kookpunt
950,15 K | 677 °C | 1250,6 °F
Heat of Fusion
2 kJ/mol
Heat of Vaporization
65 kJ/mol
Spesifieke Hitte Kapasiteit
-
Oorvloed in die aardkors
n/a
Oorvloed in die heelal
n/a
CAS Nommer
7440-73-5
PubChem CID Nommer
n/a
Atomiese Eienskappe
Atoom radius
260 pm
Kovalente Radius
348 pm
Elektronegatiewiteit
0,7 (Pauling scale)
Ionisasie potensiaal
4,0727 eV
Atoom volume
71,07 cm3/mol
Termiese geleidingsvermoë
0,15 W/cm·K
Oksidasiestate
1
Toepassings
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
Isotope
Stabiele Isotope
-Onstabiele Isotope
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