Symbol
Tb
  
Rg
  
Group Number
Not Available
  
Period Number
6
  
7
  
Block
f block
  
d block
  
Element Family
Lanthanide
  
Unknown
  
Space Group Name
P63/mmc
  
Not Available
  
Interesting Facts
- At times Terbium metal acts same as Calcium.
- Terbium metal closely similar to Lanthanum metal.
  
Not Available
  
Sources
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals
  
Synthetically Produced
  
History
  
  
Who Discovered
Carl Gustaf Mosander
  
Gesellschaft für Schwerionenforschung
  
Discovery
In 1842
  
In 1994
  
Abundance
  
  
Abundance In Universe
Not Available
  
Abundance In Sun
~0.00000001 %
  
29
~-9999 %
  
Abundance In Meteorites
Not Available
  
Abundance In Earth's Crust
Not Available
  
Abundance In Oceans
Not Available
  
Uses & Benefits
- Terbium salts are used in optical devices like laser devices.
-
Terbium’s alloy lengthens and shortens the magnetic field and this effect forms loudspeaker.
  
- Currently known uses of Roentgenium metal are limited to research purpose only.
  
Industrial Uses
Electronic Industry
  
NA
  
Medical Uses
NA
  
NA
  
Other Uses
Alloys
  
Research Purposes
  
Biological Properties
  
  
Toxicity
Low Toxic
  
Unknown
  
Present in Human Body
No
  
No
  
In Blood
Not Available
  
0.00 Blood/mg dm-3
  
37
In Bone
Not Available
  
0.00 p.p.m.
  
36
Melting Point
1,356.00 °C
  
33
Not Available
  
Boiling Point
3,123.00 °C
  
29
Not Available
  
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Silver
  
Luster
Metallic
  
Unknown Luster
  
Hardness
  
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Speed of Sound
2,620.00 m/s
  
35
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 Formula
Tb
  
Rg
  
Isotopes
  
  
Electronegativity
  
  
Allred Rochow Electronegativity
Not Available
  
Electropositivity
  
  
Ionization Energies
  
  
1st Energy Level
603.40 kJ/mol
  
99+
1,022.70 kJ/mol
  
3
2nd Energy Level
1,174.80 kJ/mol
  
99+
2,074.40 kJ/mol
  
10
3rd Energy Level
2,417.00 kJ/mol
  
99+
3,077.90 kJ/mol
  
24
4th Energy Level
4,203.00 kJ/mol
  
31
4,052.40 kJ/mol
  
36
5th Energy Level
Not Available
  
5,306.70 kJ/mol
  
31
Electrochemical Equivalent
1.98 g/amp-hr
  
31
Not Available
  
Electron Work Function
Not Available
  
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
  
NA
  
Electron Configuration
[Xe] 4f9 6s2
  
[Rn] 5f14 6d9 7s2
  
Crystal Structure
Hexagonal Close Packed (HCP)
  
Body Centered Cubic (BCC)
  
Crystal Lattice
HCP-Crystal-Structure-of-Terbium.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Radius
Not Available
  
Covalent Radius
Not Available
  
Van der Waals Radius
Not Available
  
Atomic Weight
158.93 amu
  
99+
Atomic Volume
19.20 cm3/mol
  
22
Not Available
  
Adjacent Atomic Numbers
  
  
Valence Electron Potential
46.80 (-eV)
  
33
Not Available
  
Lattice Constant
Not Available
  
Lattice Angles
π/2, π/2, 2 π/3
  
NA
  
Lattice C/A Ratio
Not Available
  
Density
  
  
Density At Room Temperature
8.23 g/cm3
  
99+
Density When Liquid (at m.p.)
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
Ductile, Malleable
  
Unknown
  
Magnetic Characteristics
  
  
Specific Gravity
Not Available
  
Magnetic Ordering
Paramagnetic
  
Unknown
  
Electrical Properties
  
  
Electrical Property
Conductor
  
Unknown
  
Resistivity
Not Available
  
Electrical Conductivity
0.01 10
6/cm Ω
  
99+
Not Available
  
Electron Affinity
50.00 kJ/mol
  
21
Not Available
  
Specific Heat
0.18 J/(kg K)
  
33
Not Available
  
Molar Heat Capacity
28.91 J/mol·K
  
9
Not Available
  
Thermal Conductivity
11.10 W/m·K
  
99+
Not Available
  
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
10.30 µm/(m·K)
  
38
Not Available
  
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
Not Available
  
Standard Molar Entropy
73.20 J/mol.K
  
10
Not Available