Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-73-5
Mendeleev Number
6
Pettifor Number
7
Glawe Number
7
Mass
Atomic Mass
223 Da
Periodic Position
X Position
1
Y Position
7
Period
7
Group
1
Classification
Block
s
Category
Alkaline Metals
Geochemical
U/Th decay series
Goldschmidt
Synthetic
Abundance
Meteorites
N/A %
Color
Jmol
#420066
Molcas Gv
#420066
CPK
#FFFFFF
Atomic Radius
Van Der Waals
348
Rahm
258
Uff
490
Mm3
364
Truhlar
348
Covalent (Cordero)
260
Covalent (Pyykko)
223
Covalent (Pyykko Double)
218
Temperature
Melting/Freeze (USE)
300 °K
Melting/Freeze (CRC)
300 °K
Boiling/Density (USE)
950 °K
Density
STP
1.87 kg/cm³
Heat
Heat Of Fusion USE
15 kJ/mol
Heat Capacity LNG
31.8 J/gK
Adiabatic Index
N/A
Etymology
Description
It is a radioactive element located in the first group of the periodic table. It is found in uranium and thorium ores. All 22 known isotopes are radioactive, the most stable being Fr-223. Its existence was discovered and confirmed by Marguerite Perey in 1939.
Language Of Origin
French
Origin Of Word
From the New Latin name of France, Francia
Meaning
Proper noun (literal meaning: "Land of the Franks")
Symbol Origin
place name
Etymological Description
It is named after France, where it was discovered (at the Curie Institute in Paris).
Discovery & Isolation
Observed/Predicted By
M. Perei
Observed/Discovery Year
1939
Discovery Location
Production & Use
Sources
It is formed by the decomposition of actinium. Its chemical properties are similar to cesium. It decays to radium or astatine.
Uses
Francium has no significant commercial use because its isotopes have very short half-lives.
Radioactivity
Half Life
21.7 minutes
Lifetime
31.7 minutes
Decay Mode
solid book zunumu
Electron Affinity
Electron Affinity (eV)
0.486
Electron Affinity (kJ/mol)
46.89
Electron Affinity (pauling)
0.79
Electron Affinity (ghosh)
0.08731
Dipole Polarity
Accepted
317.8
Uncertainty
2.4
Lattice
Strucutre
BCC
Electron & Quantum
Oxidation States
1
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s1
Quantum Number
2S1/2
Electron Configuration Semantic
[Rn] 7s1
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
18
Shells-5
8
Shells-6
1
Ionization Energies-0
380
