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Terbium vs Roentgenium


Roentgenium vs Terbium


Periodic Table

Symbol
Tb   
Rg   

Group Number
Not Available   
11   
7

Period Number
6   
7   

Block
f block   
d block   

Element Family
Lanthanide   
Unknown   

CAS Number
7440279   
99+
54386242   
1

Space Group Name
P63/mmc   
Not Available   

Space Group Number
194.00   
5
194.00   
5

Facts

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
5 * 10-8 %   
27
Not Available   

Abundance In Sun
~0.00000001 %   
29
~-9999 %   

Abundance In Meteorites
0.00 %   
99+
Not Available   

Abundance In Earth's Crust
0.00 %   
40
Not Available   

Abundance In Oceans
0.00 %   
99+
Not Available   

Uses

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

Physical Properties

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
677.00 MPa   
17
Not Available   

Vickers Hardness
863.00 MPa   
13
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 Properties

Chemical Formula
Tb   
Rg   

Isotopes
  
  

Known Isotopes
26   
13
1   
34

Electronegativity
  
  

Allred Rochow Electronegativity
1.10   
30
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
3.00 eV   
36
Not Available   

Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
NA   

Atomic Properties

Atomic Number
65   
99+
111   
7

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
  
  

Number of Protons
65   
99+
111   
7

Number of Neutrons
94   
36
161   
3

Number of Electrons
65   
99+
111   
7

Radius of an Atom
  
  

Atomic Radius
177.00 pm   
17
Not Available   

Covalent Radius
194.00 pm   
16
Not Available   

Van der Waals Radius
221.00 pm   
22
Not Available   

Atomic Weight
158.93 amu   
99+
281.00 amu   
6

Atomic Volume
19.20 cm3/mol   
22
Not Available   

Adjacent Atomic Numbers
  
  

Previous Element
Gadolinium
  

Next Element
Dysprosium
  

Valence Electron Potential
46.80 (-eV)   
33
Not Available   

Lattice Constant
360.10 pm   
36
Not Available   

Lattice Angles
π/2, π/2, 2 π/3   
NA   

Lattice C/A Ratio
1.58   
13
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
8.23 g/cm3   
99+
28.70 g/cm3   
6

Density When Liquid (at m.p.)
7.65 g/cm3   
30
Not Available   

Tensile Strength
60.00 MPa   
17
Not Available   

Viscosity
Not Available   
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   

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
Ductile, Malleable   
Unknown   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
8.23   
39
Not Available   

Magnetic Ordering
Paramagnetic   
Unknown   

Electrical Properties
  
  

Electrical Property
Conductor   
Unknown   

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   

Thermal Properties

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   

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