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Neptunium vs Actinium

Neptunium
Actinium
Actinium vs Neptunium


Periodic Table
Symbol
Np   
Ac   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7439998   
99+
7440348   
99+
Space Group Name
Pnma   
Fm_ 3m   
Space Group Number
62.00   
11
225.00   
2
Facts
Interesting Facts
Not Available   
Not Available   
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
Obtained by Treating Radium with Neutrons, Ores of metals   
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson   
Friedrich Oskar Giesel   
Discovery
In 1940   
In 1902   
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.
  
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Toxic   
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
640.00 °C   
99+
1,227.00 °C   
38
Boiling Point
3,902.00 °C   
13
3,200.00 °C   
26
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
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   
Ac   
Isotopes
  
  
Known Isotopes
20   
19
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
1.10   
99+
Allred Rochow Electronegativity
1.22   
26
1.00   
36
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
2.90   
10
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
499.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,170.00 kJ/mol   
99+
3rd Energy Level
1,997.00 kJ/mol   
99+
1,900.00 kJ/mol   
99+
4th Energy Level
3,242.00 kJ/mol   
99+
4,700.00 kJ/mol   
23
Electrochemical Equivalent
1.77 g/amp-hr   
39
2.82 g/amp-hr   
18
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
89   
29
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Rn] 6d1 7s2   
Crystal Structure
Orthorhombic (ORTH)   
Face Centered Cubic (FCC)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
FCC-Crystal-Structure-of-Actinium.jpg#100   
Atom
  
  
Number of Protons
93   
25
89   
29
Number of Neutrons
144   
14
138   
16
Number of Electrons
93   
25
89   
29
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
195.00 pm   
7
Covalent Radius
190.00 pm   
18
Not Available   
Van der Waals Radius
221.00 pm   
22
Not Available   
Atomic Weight
237.00 amu   
22
227.00 amu   
25
Atomic Volume
11.62 cm3/mol   
99+
22.54 cm3/mol   
11
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Radium
  
Next Element
Plutonium
  
Thorium
  
Valence Electron Potential
96.00 (-eV)   
9
38.60 (-eV)   
99+
Lattice Constant
666.30 pm   
3
567.00 pm   
8
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
10.00 g/cm3   
37
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
10.07   
28
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
1.22 nΩ·m   
99+
Not Available   
Electrical Conductivity
0.01 106/cm Ω   
99+
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.12 J/(kg K)   
40
Molar Heat Capacity
29.46 J/mol·K   
8
27.20 J/mol·K   
18
Thermal Conductivity
6.30 W/m·K   
99+
12.00 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   
301.00 kJ/mol   
36
Standard Molar Entropy
Not Available   
56.50 J/mol.K   
25
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