Neptunium vs Francium
Periodic Table
Symbol
Np
Fr
Group Number
Not Available
1
17
Period Number
7
7
Block
f block
s block
Element Family
Actinide
Alkali
CAS Number
7439998
99+
7440735
18
Space Group Name
Pnma
Not Available
Space Group Number
62.00
11
Not Available
Facts
Interesting Facts
Not Available
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals
Formed by Decay Process, Mining
History
Who Discovered
Edwin McMillan and Philip H. Abelson
Marguerite Perey
Discovery
In 1940
In 1939
Abundance
Uses
Uses & Benefits
- Currently known uses of Neptunium metal are limited to research purpose only.
- Neptunium’s isotope neptunium-237 is used as a neutron detectors.
- Francium has no known uses as it has a half life of only 22 minutes.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research, Research Purposes
NA
Biological Properties
Toxicity
Toxic
NA
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
640.00 °C
99+
27.00 °C
99+
Boiling Point
3,902.00 °C
13
677.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silver
NA
Luster
Metallic
NA
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
Np
Fr
Isotopes
Known Isotopes
20
19
33
6
Electronegativity
Pauling Electronegativity
1.36
29
0.70
99+
Allred Rochow Electronegativity
1.22
26
0.86
99+
Mulliken-Jaffe Electronegativity
Not Available
0.68
25
Allen Electronegativity
Not Available
0.67
99+
Electropositivity
Pauling Electropositivity
2.64
25
3.30
1
Ionization Energies
1st Energy Level
604.50 kJ/mol
99+
380.00 kJ/mol
99+
2nd Energy Level
1,128.00 kJ/mol
99+
Not Available
3rd Energy Level
1,997.00 kJ/mol
99+
Not Available
4th Energy Level
3,242.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
1.77 g/amp-hr
39
8.32 g/amp-hr
1
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
93
25
87
31
Electron Configuration
[Rn] 5f4 6d1 7s2
[Rn] 7s1
Crystal Structure
Orthorhombic (ORTH)
Body Centered Cubic (BCC)
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
93
25
87
31
Number of Neutrons
144
14
136
17
Number of Electrons
93
25
87
31
Radius of an Atom
Atomic Radius
155.00 pm
30
Not Available
Covalent Radius
190.00 pm
18
260.00 pm
1
Van der Waals Radius
221.00 pm
22
348.00 pm
1
Atomic Weight
237.00 amu
22
223.00 amu
27
Atomic Volume
11.62 cm3/mol
99+
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
96.00 (-eV)
9
8.00 (-eV)
99+
Lattice Constant
666.30 pm
3
Not Available
Lattice Angles
π/2, π/2, π/2
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
19.38 g/cm3
14
1.87 g/cm3
99+
Tensile Strength
125.00 MPa
14
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.11 (Pa)
17
Not Available
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
Ductile
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
20.25
6
Not Available
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Poor Conductor
Resistivity
1.22 nΩ·m
99+
3.00 nΩ·m
99+
Electrical Conductivity
0.01 106/cm Ω
99+
0.03 106/cm Ω
40
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
Not Available
Molar Heat Capacity
29.46 J/mol·K
8
Not Available
Thermal Conductivity
6.30 W/m·K
99+
15.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Fusion
3.20 kJ/mol
99+
Not Available
Enthalpy of Atomization
Not Available
71.00 kJ/mol
99+
Standard Molar Entropy
Not Available
Not Available
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