Francium Uranium Comparison
Periodic Table
Symbol
Fr
U
Group Number
1
17
0
18
Period Number
7
7
Block
s block
f block
Element Family
Alkali
Actinide
CAS Number
7440735
18
7440611
28
Space Group Name
Not Available
Cmcm
Space Group Number
Not Available
63.00
10
Facts
Interesting Facts
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
- Major mining countries of Uranium include Russia, Australia, Namibia, Canada and Niger and total 33% Uranium are mine in Kazakhstan.
Sources
Formed by Decay Process, Mining
Earth's crust, Mining, Ores of Minerals
History
Who Discovered
Marguerite Perey
Not Available
Discovery
In 1939
In 1789
Abundance
Abundance In Universe
Not Available
2 * 10-8 %
29
Abundance In Sun
~-9999 %
~0.0000001 %
26
Abundance In Meteorites
Not Available
0.00 %
99+
Abundance In Earth's Crust
Not Available
0.00 %
36
Abundance In Oceans
Not Available
0.00 %
11
Uses
Uses & Benefits
- Francium has no known uses as it has a half life of only 22 minutes.
- The main use of this metal include nuclear fuel which is used to generate electricity yin nuclear power stations.
- Synthetic elements like transuranium are made from Uranium metal.
Industrial Uses
NA
Ammunition Industry, Chemical Industry
Medical Uses
NA
NA
Other Uses
NA
Alloys, Jewellery, Nuclear Reactor's Fuel, Sculptures, Statues
Biological Properties
Toxicity
NA
Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
Not Available
In Bone
0.00 p.p.m.
36
Not Available
Physical Properties
Melting Point
27.00 °C
99+
1,132.00 °C
39
Boiling Point
677.00 °C
99+
3,818.00 °C
16
Appearance
Physical State
Solid
Solid
Color
NA
Silvery Gray
Luster
NA
Metallic
Hardness
Mohs Hardness
Not Available
6.00
6
Brinell Hardness
Not Available
2,350.00 MPa
2
Vickers Hardness
Not Available
1,960.00 MPa
2
Speed of Sound
Not Available
3,155.00 m/s
25
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Fr
U
Isotopes
Known Isotopes
33
6
25
14
Electronegativity
Pauling Electronegativity
0.70
99+
1.38
28
Allred Rochow Electronegativity
0.86
99+
1.22
26
Mulliken-Jaffe Electronegativity
0.68
25
Not Available
Allen Electronegativity
0.67
99+
Not Available
Electropositivity
Pauling Electropositivity
3.30
1
2.62
26
Ionization Energies
1st Energy Level
380.00 kJ/mol
99+
597.60 kJ/mol
99+
2nd Energy Level
Not Available
1,420.00 kJ/mol
99+
3rd Energy Level
Not Available
1,900.00 kJ/mol
99+
4th Energy Level
Not Available
3,145.00 kJ/mol
99+
Electrochemical Equivalent
8.32 g/amp-hr
1
1.48 g/amp-hr
99+
Electron Work Function
Not Available
3.63 eV
30
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
87
31
92
26
Electron Configuration
[Rn] 7s1
[Rn] 5f3 6d1 7s2
Crystal Structure
Body Centered Cubic (BCC)
Orthorhombic (ORTH)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
ORTH-Crystal-Structure-of-Uranium.jpg#100
Atom
Number of Protons
87
31
92
26
Number of Neutrons
136
17
146
13
Number of Electrons
87
31
92
26
Radius of an Atom
Atomic Radius
Not Available
156.00 pm
29
Covalent Radius
260.00 pm
1
196.00 pm
14
Van der Waals Radius
348.00 pm
1
186.00 pm
33
Atomic Weight
223.00 amu
27
238.03 amu
21
Atomic Volume
Not Available
12.59 cm3/mol
40
Adjacent Atomic Numbers
Valence Electron Potential
8.00 (-eV)
99+
170.00 (-eV)
4
Lattice Constant
Not Available
295.08 pm
99+
Lattice Angles
NA
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
1.87 g/cm3
99+
19.10 g/cm3
17
Density When Liquid (at m.p.)
Not Available
17.30 g/cm3
7
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
Not Available
0.01 (Pa)
20
Elasticity properties
Shear Modulus
Not Available
111.00 GPa
10
Bulk Modulus
Not Available
100.00 GPa
16
Young's Modulus
Not Available
208.00 GPa
10
Poisson Ratio
Not Available
0.23
30
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
18.80
10
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Poor Conductor
Poor Conductor
Resistivity
3.00 nΩ·m
99+
0.28 nΩ·m
99+
Electrical Conductivity
0.03 106/cm Ω
40
0.04 106/cm Ω
37
Thermal Properties
Specific Heat
Not Available
0.12 J/(kg K)
40
Molar Heat Capacity
Not Available
27.67 J/mol·K
15
Thermal Conductivity
15.00 W/m·K
99+
27.50 W/m·K
40
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
13.90 µm/(m·K)
27
Enthalpy
Enthalpy of Vaporization
Not Available
477.00 kJ/mol
13
Enthalpy of Fusion
Not Available
15.48 kJ/mol
19
Enthalpy of Atomization
71.00 kJ/mol
99+
489.50 kJ/mol
14
Standard Molar Entropy
Not Available
50.20 J/mol.K
31
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