Francium
87
Fr
Groep
1
Periode
7
Blok
s
Protonen
Elektronen
Neutronen
87
87
136
Algemene Eigenschappen
Atoomnummer
87
Atomair gewicht
[223]
Massa Getal
223
Categorie
Alkalimetalen
Kleur
Zilver
Radioactief
Ja
Francium was named after France
Kristalstructuur
n.v.t.
Historie
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.
Eletronen per schil
2, 8, 18, 32, 18, 8, 1
Electronconfiguratie
[Rn] 7s1
Francium was the last element discovered in nature, rather than by synthesis
Fysieke Eigenschappen
Fase
Vast
Dichtheid
1,87 g/cm3
Smeltpunt
296,15 K | 23 °C | 73,4 °F
Kookpunt
950,15 K | 677 °C | 1250,6 °F
Fusiewarmte
2 kJ/mol
Verdampingswarmte
65 kJ/mol
Specifieke Warmtecapaciteit
-
Overvloedig aanwezig in de aardkorst
n.v.t.
Overvloedig aanwezig in het universum
n.v.t.
CAS-nummer
7440-73-5
PubChem CID nummer
n.v.t.
Atoomeigenschappen
Atoomstraal
260 pm
Covalentiestraal
348 pm
Electronegativiteit
0,7 (Pauling schaal)
Ionisatiepotentiaal
4,0727 eV
Atoomvolume
71,07 cm3/mol
Thermische geleiding
0,15 W/cm·K
Oxidatietoestanden
1
Toepassingen
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
Isotopen
Stabiele isotopen
-Instabiele isotopen
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