Symbol
Rg
Tb
Group Number
113
0
17
👆🏻
Period Number
76
2
7
👆🏻
Block
d block
f block
Element Family
-
Lanthanide
CAS Number
543862427440279
7429905
54386242
👆🏻
Space Group Name
-
P63/mmc
Space Group Number
194.00194.00
11
276
👆🏻
Interesting Facts
Roentgenium is a highly unstable synthetic element.
- At times Terbium metal acts same as Calcium.
- Terbium metal closely similar to Lanthanum metal.
Sources
Synthetically Produced
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals
History
Who Discovered
Gesellschaft für Schwerionenforschung
Carl Gustaf Mosander
Discovery
In 1994
In 1842
Abundance
Abundance In Universe
0.00 %0.00 %
0
0.11
👆🏻
Abundance In Sun
-0.00 %
0
0.1
👆🏻
Abundance In Meteorites
-0.00 %
0
22
👆🏻
Abundance In Earth's Crust
-0.00 %
1E-37
8.1
👆🏻
Abundance In Oceans
-0.00 %
0
1.1
👆🏻
Abundance In Humans
-0.00 %
0
1.4
👆🏻
Uses & Benefits
- Currently known uses of Roentgenium metal are limited to research purpose only.
- Terbium salts are used in optical devices like laser devices.
-
Terbium’s alloy lengthens and shortens the magnetic field and this effect forms loudspeaker.
Industrial Uses
-
Electronic Industry
Medical Uses
-
-
Other Uses
Research Purposes
Alloys
Biological Properties
Toxicity
-
Low Toxic
Present in Human Body
✔
✘
✔
✘
In Blood
0.00 Blood/mg dm-30.00 Blood/mg dm-3
0
1970
👆🏻
In Bone
0.00 p.p.m.0.00 p.p.m.
0
170000
👆🏻
Melting Point
-1,356.00 °C
-38.83
3410
👆🏻
Boiling Point
2,800.00 °C3,123.00 °C
0
5660
👆🏻
Appearance
Physical State
Solid
Solid
Color
Silver
Silvery White
Luster
Unknown Luster
Metallic
Hardness
Mohs Hardness
-1.50
0.2
8.5
👆🏻
Brinell Hardness
700.00 MPa677.00 MPa
0.14
3490
👆🏻
Vickers Hardness
450.00 MPa863.00 MPa
0
3920
👆🏻
Speed of Sound
3,430.00 m/s2,620.00 m/s
818
16200
👆🏻
Optical Properties
Refractive Index
1.301.60
0.155
3.41
👆🏻
Reflectivity
64.00 %35.00 %
5
97
👆🏻
Allotropes
✔
✘
✔
✘
α Allotropes
-
-
β Allotropes
-
-
γ Allotropes
-
-
Chemical Formula
Rg
Tb
Isotopes
Known Isotopes
126
0
38
👆🏻
Electronegativity
Pauling Electronegativity
0.001.20
0
2.6
👆🏻
Sanderson Electronegativity
1.901.20
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.301.10
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
0.901.20
0.62
2.48
👆🏻
Allen Electronegativity
0.801.20
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.202.20
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
1,022.70 kJ/mol603.40 kJ/mol
375.7
26130
👆🏻
2nd Energy Level
2,074.40 kJ/mol1,174.80 kJ/mol
392.8
28750
👆🏻
3rd Energy Level
3,077.90 kJ/mol2,417.00 kJ/mol
392.8
34230
👆🏻
4th Energy Level
4,052.40 kJ/mol4,203.00 kJ/mol
375.7
37066
👆🏻
5th Energy Level
5,306.70 kJ/mol5,658.00 kJ/mol
392
97510
👆🏻
6th Energy Level
11,100.00 kJ/mol5,658.00 kJ/mol
1007
105800
👆🏻
7th Energy level
5,800.00 kJ/mol5,420.00 kJ/mol
1007
114300
👆🏻
8th Energy Level
5,800.00 kJ/mol5,650.00 kJ/mol
730
125300
👆🏻
9th Energy Level
5,650.00 kJ/mol5,650.00 kJ/mol
1007
134700
👆🏻
10th Energy Level
5,800.00 kJ/mol5,650.00 kJ/mol
392
144300
👆🏻
11th Energy Level
8,300.00 kJ/mol5,650.00 kJ/mol
392
169988
👆🏻
12th Energy Level
8,300.00 kJ/mol5,650.00 kJ/mol
0
189368
👆🏻
13th Energy Level
8,700.00 kJ/mol5,650.00 kJ/mol
1007
76015
👆🏻
14th Energy Level
8,300.00 kJ/mol5,650.00 kJ/mol
380
86450
👆🏻
15th Energy Level
87,000.00 kJ/mol56,500.00 kJ/mol
33000
100700
👆🏻
16th Energy Level
83,000.00 kJ/mol56,500.00 kJ/mol
375.7
109480
👆🏻
17th Energy Level
830.80 kJ/mol565.80 kJ/mol
375.7
122200
👆🏻
18th Energy Level
8,300.00 kJ/mol5,658.00 kJ/mol
0
134810
👆🏻
19th Energy Level
580.00 kJ/mol565.00 kJ/mol
375.7
148700
👆🏻
20th Energy Level
580.00 kJ/mol565.00 kJ/mol
0
171200
👆🏻
21st Energy Level
5,800.00 kJ/mol565.80 kJ/mol
375.7
179100
👆🏻
22nd Energy Level
580.00 kJ/mol565.00 kJ/mol
330
184900
👆🏻
23rd Energy Level
5,800.00 kJ/mol565.80 kJ/mol
357.6
198800
👆🏻
24th Energy Level
538.70 kJ/mol565.80 kJ/mol
297.3
195200
👆🏻
25th Energy Level
0.00 kJ/mol565.00 kJ/mol
0
121900
👆🏻
26th Energy Level
580.00 kJ/mol565.80 kJ/mol
357.6
127700
👆🏻
27th Energy Level
580.00 kJ/mol565.80 kJ/mol
0
133800
👆🏻
28th Energy Level
880.00 kJ/mol565.80 kJ/mol
297.3
139800
👆🏻
29th Energy Level
580.00 kJ/mol565.80 kJ/mol
0
148100
👆🏻
30th Energy Level
0.00 kJ/mol565.00 kJ/mol
0
154500
👆🏻
Electrochemical Equivalent
3.10 g/amp-hr1.98 g/amp-hr
0.16812
8.3209
👆🏻
Electron Work Function
4.90 eV3.00 eV
2.14
6
👆🏻
Other Chemical Properties
-
Ionization, Radioactive Isotopes, Solubility
Atomic Number
11165
3
117
👆🏻
Electron Configuration
[Rn] 5f14 6d9 7s2
[Xe] 4f9 6s2
Crystal Structure
Body Centered Cubic (BCC)
Hexagonal Close Packed (HCP)
Crystal Lattice
Atom
Number of Protons
11165
3
117
👆🏻
Number of Neutrons
16194
4
285
👆🏻
Number of Electrons
11165
3
117
👆🏻
Radius of an Atom
Atomic Radius
200.00 pm177.00 pm
0
348
👆🏻
Covalent Radius
126.00 pm194.00 pm
0
260
👆🏻
Van der Waals Radius
280.00 pm221.00 pm
0
348
👆🏻
Atomic Weight
281.00 amu158.93 amu
6.94
294
👆🏻
Atomic Volume
28.70 cm3/mol19.20 cm3/mol
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
11.90 (-eV)46.80 (-eV)
0
392.42
👆🏻
Lattice Constant
0.00 pm360.10 pm
0
891.25
👆🏻
Lattice Angles
-
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.901.58
0.423
1.9
👆🏻
Density
Density At Room Temperature
28.70 g/cm38.23 g/cm3
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
28.70 g/cm37.65 g/cm3
0.512
41
👆🏻
Tensile Strength
65.00 MPa60.00 MPa
0.1
11000
👆🏻
Viscosity
0.000.00
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)0.00 (Pa)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)12.50 (Pa)
0
774
👆🏻
Elasticity properties
Shear Modulus
26.00 GPa22.10 GPa
1.3
222
👆🏻
Bulk Modulus
0.00 GPa38.70 GPa
0
462
👆🏻
Young's Modulus
12.70 GPa55.70 GPa
0
528
👆🏻
Poisson Ratio
0.300.26
0.032
0.47
👆🏻
Other Mechanical Properties
-
Ductile, Malleable
Magnetic Characteristics
Specific Gravity
28.708.23
0.53
4500
👆🏻
Magnetic Ordering
-
Paramagnetic
Permeability
0.00 H/m0.00 H/m
1.25643E-06
0.0063
👆🏻
Susceptibility
0.000.00
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
-
Conductor
Resistivity
0.20 nΩ·m1.15 nΩ·m
0.1
961
👆🏻
Electrical Conductivity
0.00 106/cm Ω0.01 106/cm Ω
0
0.63
👆🏻
Electron Affinity
50.00 kJ/mol50.00 kJ/mol
0
222.8
👆🏻
Specific Heat
0.13 J/(kg K)0.18 J/(kg K)
0.1
3.6
👆🏻
Molar Heat Capacity
23.70 J/mol·K28.91 J/mol·K
13.1
62.7
👆🏻
Thermal Conductivity
0.10 W/m·K11.10 W/m·K
0
429
👆🏻
Critical Temperature
1,100.00 K1,629.00 K
26.3
3695
👆🏻
Thermal Expansion
12.60 µm/(m·K)10.30 µm/(m·K)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
580.00 kJ/mol330.90 kJ/mol
7.32
799.1
👆🏻
Enthalpy of Fusion
-10.80 kJ/mol
2.1
35.23
👆🏻
Enthalpy of Atomization
580.00 kJ/mol314.00 kJ/mol
61.5
837
👆🏻
Standard Molar Entropy
57.00 J/mol.K73.20 J/mol.K
9.5
198.1
👆🏻