Fransium
87
Fr
Kumpulan
1
Kala
7
Blok
s
Proton
Elektron
Neutron
87
87
136
Ciri-Ciri Am
Nombor atom
87
Berat atom
[223]
Nombor jisim
223
Kategori
Logam alkali
Warna
Perak
Radioaktif
Ya
Francium was named after France
Struktur hablur
Tiada
Sejarah
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.
Bilangan elektron per petala
2, 8, 18, 32, 18, 8, 1
Konfigurasi elektron
[Rn] 7s1
Francium was the last element discovered in nature, rather than by synthesis
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
1.87 g/cm3
Takat lebur
296.15 K | 23 °C | 73.4 °F
Takat didih
950.15 K | 677 °C | 1250.6 °F
Haba pelakuran
2 kJ/mol
Haba pengewapan
65 kJ/mol
Muatan haba molar
-
Banyak pada kerak bumi
Tiada
Banyak pada alam semesta
Tiada
Nombor CAS
7440-73-5
Nombor PubChem CID
Tiada
Ciri-Ciri Atom
Jejari atom
260 pm
Jejari kovalen
348 pm
Keelektronegatifan
0.7 (Skala Pauling)
Kebolehan mengion
4.0727 eV
Isipadu atom
71.07 cm3/mol
Daya pengaliran terma
0.15 W/cm·K
Keadaan pengoksidaan
1
Aplikasi
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
Isotop
Isotop stabil
-Isotop tidak stabil
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