Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia (north of Moscow), where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.
It belongs to group 5 of the periodic table having trivial name .
Dubnium Facts
Read key information and facts about element Dubnium
Name | Dubnium |
Atomic Number | 105 |
Atomic Symbol | Db |
Atomic Weight | 262 |
Phase | Solid |
Color | - |
Appearance | - |
Classification | Transition Metal |
Group in Periodic Table | 5 |
Group Name | vanadium family |
Period in Periodic Table | period 7 |
Block in Periodic Table | d -block |
Electronic Configuration | [Rn] 5f14 6d3 7s2 |
Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 32, 11, 2 |
Melting Point | - |
Boiling Point | - |
CAS Number | CAS53850-35-4 |
How to Locate Dubnium on Periodic Table
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 105 to find Dubnium on periodic table.
Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Dubnium on periodic table look for cross section of group 5 and period 7 in the modern periodic table.
Dubnium History
The element Dubnium was discovered by A. Ghiorso, M. Nurmia, K. Eskola, J. Harris and P. Eskola in year 1970 in Russia and United States. Dubnium was first isolated by in . Dubnium derived its name from Dubna, Russia.
Prepared by bombardment of californium with nitrogen atoms.
Dubnium Presence: Abundance in Nature and Around Us
The table below shows the abundance of Dubnium in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.
ppb by weight (1ppb =10^-7 %) | ppb by atoms (1ppb =10^-7 %) | |
---|---|---|
Abundance in Universe | - | - |
Abundance in Sun | - | - |
Abundance in Meteorites | - | - |
Abundance in Earth's Crust | - | - |
Abundance in Oceans | - | - |
Abundance in Humans | - | - |
Crystal Structure of Dubnium
The solid state structure of Dubnium is Body Centered Cubic.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.
Unit Cell Parameters
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)
a | b | c |
---|---|---|
and the angles between them Lattice Angles (alpha, beta and gamma).
alpha | beta | gamma |
---|---|---|
The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.
Space Group Name | - |
Space Group Number | - |
Crystal Structure | Body Centered Cubic |
Number of atoms per unit cell | 2 |

The number of atoms per unit cell in a simple cubic, face-centered cubic and body-centred cubic are 1,4,2 respectively.
Dubnium Atomic and Orbital Properties
Dubnium atoms have 105 electrons and the electronic shell structure is [2, 8, 18, 32, 32, 11, 2] with Atomic Term Symbol (Quantum Numbers) 4F3/2.
Atomic Number | 105 |
Number of Electrons (with no charge) | 105 |
Number of Protons | 105 |
Mass Number | 262 |
Number of Neutrons | 157 |
Shell structure (Electrons per energy level) | 2, 8, 18, 32, 32, 11, 2 |
Electron Configuration | [Rn] 5f14 6d3 7s2 |
Valence Electrons | 6d3 7s2 |
Valence (Valency) | 5 |
Main Oxidation States | 5 |
Oxidation States | 5 |
Atomic Term Symbol (Quantum Numbers) | 4F3/2 |
Bohr Atomic Model of Dubnium - Electrons per energy level

n | s | p | d | f |
---|
Ground State Electronic Configuration of Dubnium - neutral Dubnium atom
Abbreviated electronic configuration of Dubnium
The ground state abbreviated electronic configuration of Neutral Dubnium atom is [Rn] 5f14 6d3 7s2. The portion of Dubnium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Rn]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used. This is important as it is the Valence electrons 6d3 7s2, electrons in the outermost shell that determine the chemical properties of the element.
Unabbreviated electronic configuration of neutral Dubnium
Complete ground state electronic configuration for the Dubnium atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f14 6d3 7s2
Electrons are filled in atomic orbitals as per the order determined by the Aufbau principle, Pauli Exclusion Principle and Hund’s Rule.

Atomic Structure of Dubnium
Dubnium atomic radius is - , while it's covalent radius is - .
Atomic Radius Calculated | - (0 Å) |
Atomic Radius Empirical | - (0 Å) |
Atomic Volume | - |
Covalent Radius | - |
Van der Waals Radius | - |
Neutron Cross Section | - |
Neutron Mass Absorption | - |
Atomic Spectrum of Dubnium
Dubnium Chemical Properties: Dubnium Ionization Energies and electron affinity
The electron affinity of Dubnium is - .
Valence | 5 |
Electronegativity | - |
ElectronAffinity | - |
Ionization Energy of Dubnium
Refer to table below for Ionization energies of Dubnium
Ionization energy number | Enthalpy - kJ/mol |
---|
Dubnium Physical Properties
Refer to below table for Dubnium Physical Properties
Density | - |
Molar Volume | - |
Elastic Properties
Young Modulus | - |
Shear Modulus | - |
Bulk Modulus | - |
Poisson Ratio | - |
Hardness of Dubnium - Tests to Measure of Hardness of Element
Mohs Hardness | - |
Vickers Hardness | - |
Brinell Hardness | - |
Dubnium Electrical Properties
Dubnium is Conductor of electricity. Refer to table below for the Electrical properties ofDubnium
Electrical Conductivity | - |
Resistivity | - |
Superconducting Point | - |
Dubnium Heat and Conduction Properties
Thermal Conductivity | - |
Thermal Expansion | - |
Dubnium Magnetic Properties
Magnetic Type | - |
Curie Point | - |
Mass Magnetic Susceptibility | - |
Molar Magnetic Susceptibility | - |
Volume Magnetic Susceptibility | - |
Optical Properties of Dubnium
Refractive Index | - |
Acoustic Properties of Dubnium
Speed of Sound | - |
Dubnium Thermal Properties - Enthalpies and thermodynamics
Refer to table below for Thermal properties of Dubnium
Melting Point | - (-273.15°C, -459.66999999999996 °F) |
Boiling Point | - (-273.15°C, -459.66999999999996 °F) |
Critical Temperature | - |
Superconducting Point | - |
Enthalpies of Dubnium
Heat of Fusion | - |
Heat of Vaporization | - |
Heat of Combustion | - |
Dubnium Isotopes - Nuclear Properties of Dubnium
Dubnium has 16 isotopes, with between 255 and 270 nucleons. Dubnium has 0 stable naturally occuring isotopes.
Isotopes of Dubnium - Naturally occurring stable Isotopes: -.
Isotope | Z | N | Isotope Mass | % Abundance | T half | Decay Mode |
---|---|---|---|---|---|---|
255Db | 105 | 150 | 255 | Synthetic | ||
256Db | 105 | 151 | 256 | Synthetic | ||
257Db | 105 | 152 | 257 | Synthetic | ||
258Db | 105 | 153 | 258 | Synthetic | ||
259Db | 105 | 154 | 259 | Synthetic | ||
260Db | 105 | 155 | 260 | Synthetic | ||
261Db | 105 | 156 | 261 | Synthetic | ||
262Db | 105 | 157 | 262 | Synthetic | 5.56 h | AlphaEmission |
263Db | 105 | 158 | 263 | Synthetic | ||
264Db | 105 | 159 | 264 | Synthetic | ||
265Db | 105 | 160 | 265 | Synthetic | ||
266Db | 105 | 161 | 266 | Synthetic | ||
267Db | 105 | 162 | 267 | Synthetic | ||
268Db | 105 | 163 | 268 | Synthetic | ||
269Db | 105 | 164 | 269 | Synthetic | ||
270Db | 105 | 165 | 270 | Synthetic |
Regulatory and Health - Health and Safety Parameters and Guidelines
Database Search
List of unique identifiers to search the element in various chemical registry databases
Database | Identifier number |
---|---|
CAS Number - Chemical Abstracts Service (CAS) | CAS53850-35-4 |
RTECS Number | - |
CID Number | - |
Gmelin Number | - |
NSC Number | - |
Compare Dubnium with other elements
Compare Dubnium with all Group 5 elements
Compare Dubnium with all Period 7 elements
Compare Dubnium with all Transition Metal elements
FAQs
What is the electronic configuration of Dubnium?
The electronic configuration of Dubnium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f14 6d3 7s2.
What is the abbreviated electronic configuration of Dubnium?
The abbreviated electronic configuration of Dubnium is [Rn] 5f14 6d3 7s2. To form abbreviated notation of electronic configuration, the completely filled subshells are replaced by the noble gas of the preceding period in square brackets.
What is the symbol of Dubnium?
Symbol of Dubnium is Db. Dubnium is a chemical element with symbol Db and atomic number 105.
What is the position of Dubnium in the Periodic Table?
Dubnium is a chemical element with the symbol Db and atomic number 105. Dubnium is the 105 element on the periodic table. It is located in group 5 and period 7 in the modern periodic table.
What is the atomic number of Dubnium?
The atomic number of Dubnium is 105.
What is the color of Dubnium?
Dubnium is of color.
Who discovered Dubnium?
The element Dubnium was discovered by A. Ghiorso, M. Nurmia, K. Eskola, J. Harris and P. Eskola in year 1970 in Russia and United States. Dubnium was first isolated by undefined in undefined.
How many valence electrons does a Dubnium atom have?
Dubnium has 5 valence electrons. Dubnium has 105 electrons out of which 5 valence electrons are present in the 6d3 7s2 outer orbitals of atom.
What is the melting Point of Dubnium?
Melting Point of Dubnium is null K.
What is the boiling Point of Dubnium?
Boiling Point of Dubnium is null K.
What is the melting Point of Dubnium in Kelvin?
Melting Point of Dubnium in Kelvin is null K.
What is the boiling Point of Dubnium in Kelvin?
Boiling Point of Dubnium in Kelvin is null K.
What is the electronic configuration of Dubnium 105?
The electronic configuration of Dubnium will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f14 6d3 7s2.
How do you write the electron configuration for Dubnium?
The electronic configuration of Dubnium will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f14 6d3 7s2.