Francium vs Neptunium
Periodic Table
Symbol
Fr
Np
Group Number
1
17
Not Available
Period Number
7
7
Block
s block
f block
Element Family
Alkali
Actinide
CAS Number
7440735
18
7439998
99+
Space Group Name
Not Available
Pnma
Space Group Number
Not Available
62.00
11
Facts
Interesting Facts
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
Not Available
Sources
Formed by Decay Process, Mining
Made by Bombarding Uranium with Neutrons, Ores of metals
History
Who Discovered
Marguerite Perey
Edwin McMillan and Philip H. Abelson
Discovery
In 1939
In 1940
Abundance
Uses
Uses & Benefits
- Francium has no known uses as it has a half life of only 22 minutes.
- Currently known uses of Neptunium metal are limited to research purpose only.
- Neptunium’s isotope neptunium-237 is used as a neutron detectors.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
NA
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
NA
Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
36
0.00 p.p.m.
36
Physical Properties
Melting Point
27.00 °C
99+
640.00 °C
99+
Boiling Point
677.00 °C
99+
3,902.00 °C
13
Appearance
Physical State
Solid
Solid
Color
NA
Silver
Luster
NA
Metallic
Hardness
Speed of Sound
Not Available
Not Available
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
Np
Isotopes
Known Isotopes
33
6
20
19
Electronegativity
Pauling Electronegativity
0.70
99+
1.36
29
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
2.64
25
Ionization Energies
1st Energy Level
380.00 kJ/mol
99+
604.50 kJ/mol
99+
2nd Energy Level
Not Available
1,128.00 kJ/mol
99+
3rd Energy Level
Not Available
1,997.00 kJ/mol
99+
4th Energy Level
Not Available
3,242.00 kJ/mol
99+
Electrochemical Equivalent
8.32 g/amp-hr
1
1.77 g/amp-hr
39
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
87
31
93
25
Electron Configuration
[Rn] 7s1
[Rn] 5f4 6d1 7s2
Crystal Structure
Body Centered Cubic (BCC)
Orthorhombic (ORTH)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
ORTH-Crystal-Structure-of-Neptunium.jpg#100
Atom
Number of Protons
87
31
93
25
Number of Neutrons
136
17
144
14
Number of Electrons
87
31
93
25
Radius of an Atom
Atomic Radius
Not Available
155.00 pm
30
Covalent Radius
260.00 pm
1
190.00 pm
18
Van der Waals Radius
348.00 pm
1
221.00 pm
22
Atomic Weight
223.00 amu
27
237.00 amu
22
Atomic Volume
Not Available
11.62 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
8.00 (-eV)
99+
96.00 (-eV)
9
Lattice Constant
Not Available
666.30 pm
3
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+
19.38 g/cm3
14
Tensile Strength
Not Available
125.00 MPa
14
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
Not Available
0.11 (Pa)
17
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
20.25
6
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Poor Conductor
Conductor
Resistivity
3.00 nΩ·m
99+
1.22 nΩ·m
99+
Electrical Conductivity
0.03 106/cm Ω
40
0.01 106/cm Ω
99+
Thermal Properties
Specific Heat
Not Available
0.12 J/(kg K)
40
Molar Heat Capacity
Not Available
29.46 J/mol·K
8
Thermal Conductivity
15.00 W/m·K
99+
6.30 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Fusion
Not Available
3.20 kJ/mol
99+
Enthalpy of Atomization
71.00 kJ/mol
99+
Not Available
Standard Molar Entropy
Not Available
Not Available
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