Symbol
Db
Group Number
5
Rank: 13 (Overall)
0
17
👆🏻
Period Number
7
Rank: 1 (Overall)
2
7
👆🏻
Block
d block
Element Family
Transition Metal
CAS Number
53850354
Rank: 14 (Overall)
7429905
54386242
👆🏻
Space Group Name
-
Space Group Number
166.00
Rank: 9 (Overall)
11
276
👆🏻
Interesting Facts
- IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
- In the production of Dubnium, thermal gradient chromatography is used.
Sources
Produced by Bombarding Am243 with Ne22, Synthetically Produced
History
Who Discovered
Joint Institute for Nuclear Research
Discovery
In 1968
Abundance
Abundance In Universe
0.00 %
Rank: 40 (Overall)
0
0.11
👆🏻
Abundance In Sun
-
0
0.1
👆🏻
Abundance In Meteorites
0.00 %
Rank: 54 (Overall)
0
22
👆🏻
Abundance In Earth's Crust
-
1E-37
8.1
👆🏻
Abundance In Oceans
-
0
1.1
👆🏻
Abundance In Humans
-
0
1.4
👆🏻
Uses & Benefits
- Currently known uses of Dubnium metal are limited to research purpose only.
Industrial Uses
-
Medical Uses
-
Other Uses
Research Purposes
Biological Properties
Toxicity
-
Present in Human Body
✔
✘
60% - Transition Metals Metals
In Blood
0.00 Blood/mg dm-3
Rank: 40 (Overall)
0
1970
👆🏻
In Bone
0.00 p.p.m.
Rank: 41 (Overall)
0
170000
👆🏻
Melting Point
-
-38.83
3410
👆🏻
Boiling Point
0.00 °C
Rank: 82 (Overall)
0
5660
👆🏻
Appearance
Physical State
Solid
Color
-
Luster
Unknown Luster
Hardness
Mohs Hardness
6.00
Rank: 6 (Overall)
0.2
8.5
👆🏻
Brinell Hardness
330.00 MPa
Rank: 38 (Overall)
0.14
3490
👆🏻
Vickers Hardness
400.00 MPa
Rank: 41 (Overall)
0
3920
👆🏻
Speed of Sound
2,680.00 m/s
Rank: 48 (Overall)
818
16200
👆🏻
Optical Properties
Refractive Index
1.20
Rank: 44 (Overall)
0.155
3.41
👆🏻
Reflectivity
55.00 %
Rank: 27 (Overall)
5
97
👆🏻
Allotropes
✔
✘
6% - Transition Metals Metals
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical Formula
Db
Isotopes
Known Isotopes
10
Rank: 28 (Overall)
0
38
👆🏻
Electronegativity
Pauling Electronegativity
2.20
Rank: 5 (Overall)
0
2.6
👆🏻
Sanderson Electronegativity
1.30
Rank: 25 (Overall)
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.30
Rank: 25 (Overall)
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
1.10
Rank: 44 (Overall)
0.62
2.48
👆🏻
Allen Electronegativity
1.30
Rank: 40 (Overall)
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.00
Rank: 47 (Overall)
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
664.80 kJ/mol
Rank: 38 (Overall)
375.7
26130
👆🏻
2nd Energy Level
1,546.70 kJ/mol
Rank: 39 (Overall)
392.8
28750
👆🏻
3rd Energy Level
2,378.40 kJ/mol
Rank: 54 (Overall)
392.8
34230
👆🏻
4th Energy Level
3,298.80 kJ/mol
Rank: 71 (Overall)
375.7
37066
👆🏻
5th Energy Level
4,305.20 kJ/mol
Rank: 82 (Overall)
392
97510
👆🏻
6th Energy Level
12,900.00 kJ/mol
Rank: 5 (Overall)
1007
105800
👆🏻
7th Energy level
3,300.00 kJ/mol
Rank: 85 (Overall)
1007
114300
👆🏻
8th Energy Level
5,280.00 kJ/mol
Rank: 72 (Overall)
730
125300
👆🏻
9th Energy Level
5,780.00 kJ/mol
Rank: 58 (Overall)
1007
134700
👆🏻
10th Energy Level
8,830.00 kJ/mol
Rank: 22 (Overall)
392
144300
👆🏻
11th Energy Level
3,300.00 kJ/mol
Rank: 85 (Overall)
392
169988
👆🏻
12th Energy Level
88,300.00 kJ/mol
Rank: 2 (Overall)
0
189368
👆🏻
13th Energy Level
4,760.00 kJ/mol
Rank: 76 (Overall)
1007
76015
👆🏻
14th Energy Level
1,120.00 kJ/mol
Rank: 70 (Overall)
380
86450
👆🏻
15th Energy Level
33,000.00 kJ/mol
Rank: 86 (Overall)
33000
100700
👆🏻
16th Energy Level
33,000.00 kJ/mol
Rank: 70 (Overall)
375.7
109480
👆🏻
17th Energy Level
1,129.00 kJ/mol
Rank: 19 (Overall)
375.7
122200
👆🏻
18th Energy Level
0.00 kJ/mol
Rank: 88 (Overall)
0
134810
👆🏻
19th Energy Level
1,094.90 kJ/mol
Rank: 18 (Overall)
375.7
148700
👆🏻
20th Energy Level
0.00 kJ/mol
Rank: 83 (Overall)
0
171200
👆🏻
21st Energy Level
883.00 kJ/mol
Rank: 36 (Overall)
375.7
179100
👆🏻
22nd Energy Level
330.00 kJ/mol
Rank: 84 (Overall)
330
184900
👆🏻
23rd Energy Level
1,150.00 kJ/mol
Rank: 33 (Overall)
357.6
198800
👆🏻
24th Energy Level
528.30 kJ/mol
Rank: 77 (Overall)
297.3
195200
👆🏻
25th Energy Level
0.00 kJ/mol
Rank: 81 (Overall)
0
121900
👆🏻
26th Energy Level
579.80 kJ/mol
Rank: 61 (Overall)
357.6
127700
👆🏻
27th Energy Level
0.00 kJ/mol
Rank: 86 (Overall)
0
133800
👆🏻
28th Energy Level
1,150.00 kJ/mol
Rank: 3 (Overall)
297.3
139800
👆🏻
29th Energy Level
1,094.00 kJ/mol
Rank: 5 (Overall)
0
148100
👆🏻
30th Energy Level
0.00 kJ/mol
Rank: 84 (Overall)
0
154500
👆🏻
Electrochemical Equivalent
3.00 g/amp-hr
Rank: 21 (Overall)
0.16812
8.3209
👆🏻
Electron Work Function
4.90 eV
Rank: 12 (Overall)
2.14
6
👆🏻
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Atomic Number
105
Rank: 13 (Overall)
3
117
👆🏻
Electron Configuration
[Rn] 5f14 6d3 7s2
Crystal Structure
Body Centered Cubic (BCC)
Crystal Lattice
Atom
Number of Protons
105
Rank: 13 (Overall)
3
117
👆🏻
Number of Neutrons
157
Rank: 8 (Overall)
4
285
👆🏻
Number of Electrons
105
Rank: 13 (Overall)
3
117
👆🏻
Radius of an Atom
Atomic Radius
139.00 pm
Rank: 41 (Overall)
0
348
👆🏻
Covalent Radius
149.00 pm
Rank: 37 (Overall)
0
260
👆🏻
Van der Waals Radius
0.00 pm
Rank: 53 (Overall)
0
348
👆🏻
Atomic Weight
268.00 amu
Rank: 10 (Overall)
6.94
294
👆🏻
Atomic Volume
22.80 cm3/mol
Rank: 17 (Overall)
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
0.00 (-eV)
Rank: 78 (Overall)
0
392.42
👆🏻
Lattice Constant
-
0
891.25
👆🏻
Lattice Angles
-
Lattice C/A Ratio
1.63
Rank: 14 (Overall)
0.423
1.9
👆🏻
Density
Density At Room Temperature
29.30 g/cm3
Rank: 5 (Overall)
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
29.30 g/cm3
Rank: 6 (Overall)
0.512
41
👆🏻
Tensile Strength
0.10 MPa
Rank: 52 (Overall)
0.1
11000
👆🏻
Viscosity
0.00
Rank: 25 (Overall)
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
Rank: 22 (Overall)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)
Rank: 30 (Overall)
0
774
👆🏻
Elasticity properties
Shear Modulus
34.00 GPa
Rank: 22 (Overall)
1.3
222
👆🏻
Bulk Modulus
39.00 GPa
Rank: 39 (Overall)
0
462
👆🏻
Young's Modulus
0.00 GPa
Rank: 74 (Overall)
0
528
👆🏻
Poisson Ratio
0.39
Rank: 5 (Overall)
0.032
0.47
👆🏻
Other Mechanical Properties
-
Magnetic Characteristics
Specific Gravity
39.00
Rank: 3 (Overall)
0.53
4500
👆🏻
Magnetic Ordering
-
Permeability
0.00 H/m
Rank: 17 (Overall)
1.25643E-06
0.0063
👆🏻
Susceptibility
0.00
Rank: 24 (Overall)
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
-
Resistivity
6.80 nΩ·m
Rank: 57 (Overall)
0.1
961
👆🏻
Electrical Conductivity
0.00 106/cm Ω
Rank: 71 (Overall)
0
0.63
👆🏻
Electron Affinity
-
0
222.8
👆🏻
Specific Heat
0.10 J/(kg K)
Rank: 44 (Overall)
0.1
3.6
👆🏻
Molar Heat Capacity
29.30 J/mol·K
Rank: 11 (Overall)
13.1
62.7
👆🏻
Thermal Conductivity
0.00 W/m·K
Rank: 80 (Overall)
0
429
👆🏻
Critical Temperature
1,323.00 K
Rank: 47 (Overall)
26.3
3695
👆🏻
Thermal Expansion
13.20 µm/(m·K)
Rank: 37 (Overall)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
289.70 kJ/mol
Rank: 51 (Overall)
7.32
799.1
👆🏻
Enthalpy of Fusion
-
2.1
35.23
👆🏻
Enthalpy of Atomization
-
61.5
837
👆🏻
Standard Molar Entropy
55.00 J/mol.K
Rank: 34 (Overall)
9.5
198.1
👆🏻