Fransiyum
87
Fr
Grup
1
Periyot
7
Blok
s
Protonlar
Elektronlar
Nötronlar
87
87
136
Temel Özellikleri
Atom numarası
87
Atom ağırlığı
[223]
Kütle Numarası
223
Kategori
Alkali metal
Renk
Gümüşi
Radyoaktif
Evet
Francium was named after France
Kristal yapısı
yok
Tarihi
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.
Enerji seviyesi başına Elektronlar
2, 8, 18, 32, 18, 8, 1
Elektron dizilimi
[Rn] 7s1
Francium was the last element discovered in nature, rather than by synthesis
Fiziksel Özellikleri
Faz
Katı
Yoğunluk
1,87 g/cm3
Ergime noktası
296,15 K | 23 °C | 73,4 °F
Kaynama noktası
950,15 K | 677 °C | 1250,6 °F
Ergime ısısı
2 kJ/mol
Buharlaşma ısısı
65 kJ/mol
Isı kapasitesi
-
Dünya kabuğundaki bulunulabilirliği
yok
Evrendeki bulunulabilirliği
yok
CAS Numarası
7440-73-5
PubChem CID Numarası
yok
Atom Özellikleri
Atom yarıçapı
260 pm
Kovalent yarıçapı
348 pm
Elektronegatifliği
0,7 (Pauling ölçeği)
İyonlaşma enerjisi
4,0727 eV
Atomik Hacim
71,07 cm3/mol
Isıl iletkenlik
0,15 W/cm·K
Yükseltgenme seviyeleri
1
Uygulamalar
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
İzotoplar
Kararlı izotoplar
-Kararsız izotoplar
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