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Properties of Actinium and Uranium

Actinium
Uranium
Properties of Uranium & Actinium


Physical Properties
Melting Point
1,227.00 °C   
38
1,132.00 °C   
39
Boiling Point
3,200.00 °C   
26
3,818.00 °C   
16
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
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
Not Available   
3,155.00 m/s   
25
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
Ac   
U   
Isotopes
  
  
Known Isotopes
29   
10
25   
14
Electronegativity
  
  
Pauling Electronegativity
1.10   
99+
1.38   
28
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.00   
36
1.22   
26
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
Not Available   
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.90   
10
2.62   
26
Ionization Energies
  
  
1st Energy Level
499.00 kJ/mol   
99+
597.60 kJ/mol   
99+
2nd Energy Level
1,170.00 kJ/mol   
99+
1,420.00 kJ/mol   
99+
3rd Energy Level
1,900.00 kJ/mol   
99+
1,900.00 kJ/mol   
99+
Electrochemical Equivalent
2.82 g/amp-hr   
18
1.48 g/amp-hr   
99+
Electron Work Function
Not Available   
3.63 eV   
30
Other Chemical Properties
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces.Radioactivity, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces.Radioactivity   
Mechanical Properties
Density
  
  
Density At Room Temperature
10.00 g/cm3   
37
19.10 g/cm3   
17
Density When Liquid (at m.p.)
Not Available   
17.30 g/cm3   
7
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.01 (Pa)   
20
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
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   
?
Ductility of metals defines their ability to deform under tensile stress; this is often characterized by the metals ability to be stretched into a wire.Ductile, 
?
Malleability of metals defines their ability to deform under compressive stress; this is often characterized by the metals ability to form a thin sheet by hammering or rolling.Malleable   
Periodic Table
Symbol
Ac   
U   
Group Number
Not Available   
0   
18
Period Number
7   
7   
Block
?
The f-block is in the center-left of a 32-column periodic table but in the footnoted appendage of 18-column tables. These elements are not generally considered as part of any group. They are often called inner transition metals.f block   
?
The f-block is in the center-left of a 32-column periodic table but in the footnoted appendage of 18-column tables. These elements are not generally considered as part of any group. They are often called inner transition metals.f block   
Element Family
?
Total 15 metals are included in actinide series, from Actinium to Lawrencium. Actinide series is located under f and d block of the periodic table.Actinide   
?
Total 15 metals are included in actinide series, from Actinium to Lawrencium. Actinide series is located under f and d block of the periodic table.Actinide   
Atomic Properties
Atomic Number
89   
29
92   
26
Atomic Weight
227.00 amu   
25
238.03 amu   
21
Atomic Volume
22.54 cm3/mol   
11
12.59 cm3/mol   
40
Electron Configuration
[Rn] 6d1 7s2   
[Rn] 5f3 6d1 7s2   
Valence Electron Potential
38.60 (-eV)   
99+
170.00 (-eV)   
4
Atom
  
  
Number of Protons
89   
29
92   
26
Number of Neutrons
138   
16
146   
13
Number of Electrons
89   
29
92   
26
Crystal Structure
?
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.Face Centered Cubic (FCC)   
?
Orthorhombic lattices occur due to stretching a cubic lattice along two of its orthogonal sides. It gets result in a rectangular prism with a rectangular at base. These 3 bases intersect each other at 90°.Orthorhombic (ORTH)   
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100   
ORTH-Crystal-Structure-of-Uranium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
195.00 pm   
7
156.00 pm   
29
Covalent Radius
Not Available   
196.00 pm   
14
Van der Waals Radius
Not Available   
186.00 pm   
33
Lattice Constant
567.00 pm   
8
295.08 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Thorium
  
Neptunium
  
Previous Element
Radium
  
Protactinium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
Not Available   
0.28 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.04 106/cm Ω   
37
Electron Affinity
Not Available   
Not Available   
Electrical Property
Unknown   
?
Poor conductor metals have moderate resistance to electric currents. They can conduct electric current through them with very low efficiency.Poor Conductor   
Magnetic Characteristics
  
  
Specific Gravity
10.07   
28
18.80   
10
Magnetic Ordering
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.12 J/(kg K)   
40
Thermal Conductivity
12.00 W/m·K   
99+
27.50 W/m·K   
40
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
27.20 J/mol·K   
18
27.67 J/mol·K   
15
Thermal Expansion
Not Available   
13.90 µm/(m·K)   
27
Standard Molar Entropy
56.50 J/mol.K   
25
50.20 J/mol.K   
31
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
477.00 kJ/mol   
13
Enthalpy of Fusion
Not Available   
15.48 kJ/mol   
19
Enthalpy of Atomization
301.00 kJ/mol   
36
489.50 kJ/mol   
14
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