Fransium

87
Fr
Golongan
1
Periode
7
Blok
s
Proton
Elektron
Neutron
87
87
136
Sifat Umum
Nomor atom
87
Massa atom
[223]
Nomor massa
223
Kategori
Logam alkali
Warna
Perak
Radioaktif
Ya
Francium was named after France
Struktur kristal
n/a
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.
Elektron per kulit
2, 8, 18, 32, 18, 8, 1
Konfigurasi elektron
[Rn] 7s1
Fr
Francium was the last element discovered in nature, rather than by synthesis
Sifat Fisika
Fase
Solid
Kepadatan
1,87 g/cm3
Titik lebur
296,15 K | 23 °C | 73,4 °F
Titik didih
950,15 K | 677 °C | 1250,6 °F
Kalor peleburan
2 kJ/mol
Kalor penguapan
65 kJ/mol
Kapasitas kalor molar
-
Kelimpahan di kerak bumi
n/a
Kelimpahan di alam semesta
n/a
Illustration
Kredit Gambar: Images-of-elements
Illustration of francium
Nomor CAS
7440-73-5
PubChem CID Number
n/a
Sifat Atom
Jari-jari atom
260 pm
Jari-jari kovalen
348 pm
Elektronegativitas
0,7 (Skala Pauling)
Potensi Ionisasi
4,0727 eV
Volume atom
71,07 cm3/mol
Kondusivitas termal
0,15 W/cm·K
Bilangan oksidasi
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.
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