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Properties of Terbium and Actinium

Terbium
Actinium
Properties of Actinium & Terbium


Physical Properties
Melting Point
1,356.00 °C   
33
1,227.00 °C   
38
Boiling Point
3,123.00 °C   
29
3,200.00 °C   
26
Hardness
  
  
Mohs Hardness
Not Available   
Not Available   
Brinell Hardness
677.00 MPa   
17
Not Available   
Vickers Hardness
863.00 MPa   
13
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
2,620.00 m/s   
35
Not Available   
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
Tb   
Ac   
Isotopes
  
  
Known Isotopes
26   
13
29   
10
Electronegativity
  
  
Pauling Electronegativity
Not Available   
1.10   
99+
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.10   
30
1.00   
36
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
Not Available   
Not Available   
Electropositivity
  
  
Pauling Electropositivity
Not Available   
2.90   
10
Ionization Energies
  
  
1st Energy Level
603.40 kJ/mol   
99+
499.00 kJ/mol   
99+
2nd Energy Level
1,174.80 kJ/mol   
99+
1,170.00 kJ/mol   
99+
3rd Energy Level
2,417.00 kJ/mol   
99+
1,900.00 kJ/mol   
99+
Electrochemical Equivalent
1.98 g/amp-hr   
31
2.82 g/amp-hr   
18
Electron Work Function
3.00 eV   
36
Not Available   
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, 
?
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, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
Mechanical Properties
Density
  
  
Density At Room Temperature
8.23 g/cm3   
99+
10.00 g/cm3   
37
Density When Liquid (at m.p.)
7.65 g/cm3   
30
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
29
Not Available   
Vapor Pressure at 2000 K
12.50 (Pa)   
8
Not Available   
Tensile Strength
60.00 MPa   
17
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
22.10 GPa   
32
Not Available   
Bulk Modulus
38.70 GPa   
33
Not Available   
Young's Modulus
55.70 GPa   
34
Not Available   
Poisson Ratio
0.26   
21
Not Available   
Other Mechanical Properties
?
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   
NA   
Periodic Table
Symbol
Tb   
Ac   
Group Number
Not Available   
Not Available   
Period Number
6   
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 Lanthanide series from Lanthanum to Lutetium. Lanthanide series is located under f and d block of the periodic table.Lanthanide   
?
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
65   
99+
89   
29
Atomic Weight
158.93 amu   
99+
227.00 amu   
25
Atomic Volume
19.20 cm3/mol   
22
22.54 cm3/mol   
11
Electron Configuration
[Xe] 4f9 6s2   
[Rn] 6d1 7s2   
Valence Electron Potential
46.80 (-eV)   
33
38.60 (-eV)   
99+
Atom
  
  
Number of Protons
65   
99+
89   
29
Number of Neutrons
94   
36
138   
16
Number of Electrons
65   
99+
89   
29
Crystal Structure
?
The hexagonal crystal system consists of the 7 point groups such that all their space groups have the hexagonal lattice as underlying lattice. The hexagonal crystal family consists of the 12 point groups such that at least one of their space groups has theHexagonal Close Packed (HCP)   
?
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)   
Crystal Lattice
HCP-Crystal-Structure-of-Terbium.jpg#100   
FCC-Crystal-Structure-of-Actinium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
177.00 pm   
17
195.00 pm   
7
Covalent Radius
194.00 pm   
16
Not Available   
Van der Waals Radius
221.00 pm   
22
Not Available   
Lattice Constant
360.10 pm   
36
567.00 pm   
8
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.58   
13
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Dysprosium
  
Thorium
  
Previous Element
Gadolinium
  
Radium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
1.15 nΩ·m   
99+
Not Available   
Electrical Conductivity
0.01 106/cm Ω   
99+
Not Available   
Electron Affinity
50.00 kJ/mol   
21
Not Available   
Electrical Property
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Unknown   
Magnetic Characteristics
  
  
Specific Gravity
8.23   
39
10.07   
28
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
0.18 J/(kg K)   
33
0.12 J/(kg K)   
40
Thermal Conductivity
11.10 W/m·K   
99+
12.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
28.91 J/mol·K   
9
27.20 J/mol·K   
18
Thermal Expansion
10.30 µm/(m·K)   
38
Not Available   
Standard Molar Entropy
73.20 J/mol.K   
10
56.50 J/mol.K   
25
Enthalpy
  
  
Enthalpy of Vaporization
330.90 kJ/mol   
26
Not Available   
Enthalpy of Fusion
10.80 kJ/mol   
34
Not Available   
Enthalpy of Atomization
314.00 kJ/mol   
33
301.00 kJ/mol   
36
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