Symbol
Db
Tb
Group Number
53
0
17
👆🏻
Period Number
76
2
7
👆🏻
Block
d block
f block
Element Family
Transition Metal
Lanthanide
CAS Number
538503547440279
7429905
54386242
👆🏻
Space Group Name
-
P63/mmc
Space Group Number
166.00194.00
11
276
👆🏻
Interesting Facts
- IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
- In the production of Dubnium, thermal gradient chromatography is used.
- At times Terbium metal acts same as Calcium.
- Terbium metal closely similar to Lanthanum metal.
Sources
Produced by Bombarding Am243 with Ne22, Synthetically Produced
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals
History
Who Discovered
Joint Institute for Nuclear Research
Carl Gustaf Mosander
Discovery
In 1968
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 %0.00 %
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 Dubnium 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
0.00 °C3,123.00 °C
0
5660
👆🏻
Appearance
Physical State
Solid
Solid
Color
-
Silvery White
Luster
Unknown Luster
Metallic
Hardness
Mohs Hardness
6.001.50
0.2
8.5
👆🏻
Brinell Hardness
330.00 MPa677.00 MPa
0.14
3490
👆🏻
Vickers Hardness
400.00 MPa863.00 MPa
0
3920
👆🏻
Speed of Sound
2,680.00 m/s2,620.00 m/s
818
16200
👆🏻
Optical Properties
Refractive Index
1.201.60
0.155
3.41
👆🏻
Reflectivity
55.00 %35.00 %
5
97
👆🏻
Allotropes
✔
✘
✔
✘
α Allotropes
-
-
β Allotropes
-
-
γ Allotropes
-
-
Chemical Formula
Db
Tb
Isotopes
Known Isotopes
1026
0
38
👆🏻
Electronegativity
Pauling Electronegativity
2.201.20
0
2.6
👆🏻
Sanderson Electronegativity
1.301.20
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.301.10
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
1.101.20
0.62
2.48
👆🏻
Allen Electronegativity
1.301.20
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.002.20
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
664.80 kJ/mol603.40 kJ/mol
375.7
26130
👆🏻
2nd Energy Level
1,546.70 kJ/mol1,174.80 kJ/mol
392.8
28750
👆🏻
3rd Energy Level
2,378.40 kJ/mol2,417.00 kJ/mol
392.8
34230
👆🏻
4th Energy Level
3,298.80 kJ/mol4,203.00 kJ/mol
375.7
37066
👆🏻
5th Energy Level
4,305.20 kJ/mol5,658.00 kJ/mol
392
97510
👆🏻
6th Energy Level
12,900.00 kJ/mol5,658.00 kJ/mol
1007
105800
👆🏻
7th Energy level
3,300.00 kJ/mol5,420.00 kJ/mol
1007
114300
👆🏻
8th Energy Level
5,280.00 kJ/mol5,650.00 kJ/mol
730
125300
👆🏻
9th Energy Level
5,780.00 kJ/mol5,650.00 kJ/mol
1007
134700
👆🏻
10th Energy Level
8,830.00 kJ/mol5,650.00 kJ/mol
392
144300
👆🏻
11th Energy Level
3,300.00 kJ/mol5,650.00 kJ/mol
392
169988
👆🏻
12th Energy Level
88,300.00 kJ/mol5,650.00 kJ/mol
0
189368
👆🏻
13th Energy Level
4,760.00 kJ/mol5,650.00 kJ/mol
1007
76015
👆🏻
14th Energy Level
1,120.00 kJ/mol5,650.00 kJ/mol
380
86450
👆🏻
15th Energy Level
33,000.00 kJ/mol56,500.00 kJ/mol
33000
100700
👆🏻
16th Energy Level
33,000.00 kJ/mol56,500.00 kJ/mol
375.7
109480
👆🏻
17th Energy Level
1,129.00 kJ/mol565.80 kJ/mol
375.7
122200
👆🏻
18th Energy Level
0.00 kJ/mol5,658.00 kJ/mol
0
134810
👆🏻
19th Energy Level
1,094.90 kJ/mol565.00 kJ/mol
375.7
148700
👆🏻
20th Energy Level
0.00 kJ/mol565.00 kJ/mol
0
171200
👆🏻
21st Energy Level
883.00 kJ/mol565.80 kJ/mol
375.7
179100
👆🏻
22nd Energy Level
330.00 kJ/mol565.00 kJ/mol
330
184900
👆🏻
23rd Energy Level
1,150.00 kJ/mol565.80 kJ/mol
357.6
198800
👆🏻
24th Energy Level
528.30 kJ/mol565.80 kJ/mol
297.3
195200
👆🏻
25th Energy Level
0.00 kJ/mol565.00 kJ/mol
0
121900
👆🏻
26th Energy Level
579.80 kJ/mol565.80 kJ/mol
357.6
127700
👆🏻
27th Energy Level
0.00 kJ/mol565.80 kJ/mol
0
133800
👆🏻
28th Energy Level
1,150.00 kJ/mol565.80 kJ/mol
297.3
139800
👆🏻
29th Energy Level
1,094.00 kJ/mol565.80 kJ/mol
0
148100
👆🏻
30th Energy Level
0.00 kJ/mol565.00 kJ/mol
0
154500
👆🏻
Electrochemical Equivalent
3.00 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, Radioactivity
Ionization, Radioactive Isotopes, Solubility
Atomic Number
10565
3
117
👆🏻
Electron Configuration
[Rn] 5f14 6d3 7s2
[Xe] 4f9 6s2
Crystal Structure
Body Centered Cubic (BCC)
Hexagonal Close Packed (HCP)
Crystal Lattice
Atom
Number of Protons
10565
3
117
👆🏻
Number of Neutrons
15794
4
285
👆🏻
Number of Electrons
10565
3
117
👆🏻
Radius of an Atom
Atomic Radius
139.00 pm177.00 pm
0
348
👆🏻
Covalent Radius
149.00 pm194.00 pm
0
260
👆🏻
Van der Waals Radius
0.00 pm221.00 pm
0
348
👆🏻
Atomic Weight
268.00 amu158.93 amu
6.94
294
👆🏻
Atomic Volume
22.80 cm3/mol19.20 cm3/mol
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
0.00 (-eV)46.80 (-eV)
0
392.42
👆🏻
Lattice Constant
-360.10 pm
0
891.25
👆🏻
Lattice Angles
-
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.631.58
0.423
1.9
👆🏻
Density
Density At Room Temperature
29.30 g/cm38.23 g/cm3
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
29.30 g/cm37.65 g/cm3
0.512
41
👆🏻
Tensile Strength
0.10 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
34.00 GPa22.10 GPa
1.3
222
👆🏻
Bulk Modulus
39.00 GPa38.70 GPa
0
462
👆🏻
Young's Modulus
0.00 GPa55.70 GPa
0
528
👆🏻
Poisson Ratio
0.390.26
0.032
0.47
👆🏻
Other Mechanical Properties
-
Ductile, Malleable
Magnetic Characteristics
Specific Gravity
39.008.23
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
6.80 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/mol
0
222.8
👆🏻
Specific Heat
0.10 J/(kg K)0.18 J/(kg K)
0.1
3.6
👆🏻
Molar Heat Capacity
29.30 J/mol·K28.91 J/mol·K
13.1
62.7
👆🏻
Thermal Conductivity
0.00 W/m·K11.10 W/m·K
0
429
👆🏻
Critical Temperature
1,323.00 K1,629.00 K
26.3
3695
👆🏻
Thermal Expansion
13.20 µm/(m·K)10.30 µm/(m·K)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
289.70 kJ/mol330.90 kJ/mol
7.32
799.1
👆🏻
Enthalpy of Fusion
-10.80 kJ/mol
2.1
35.23
👆🏻
Enthalpy of Atomization
-314.00 kJ/mol
61.5
837
👆🏻
Standard Molar Entropy
55.00 J/mol.K73.20 J/mol.K
9.5
198.1
👆🏻