Dubnium was first produced as 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 which has a half-life of 28 hours. In the 1960s and 1970s, microscopic amounts of dubnium were produced in laboratories in the former Soviet Union and in California.

1967 by Workers at the Nuclear Institute at Dubna and the University of California, Berkeley, USA.

DISCOVERY

From the name of the Joint Nuclear Institute at Dubna, an institute heavily involved in the search for heavy elements.

ETYMOLOGY

Dubnium

Element

Db

Symbol

105

105 Atomic Number

Atomic Number

Transition Metal

Classification

53850-35-4

CAS Number

-

Elemental Colour

-

Refractive Index

-

Poisson Ratio

9.151 cm³

Molar Volume

-

Brinell Hardness

-

Mohs Hardness

-

Vickers Hardness

-

Speed of Sound

-

Bulk Modulus

-

Shear Modulus

-

Young Modulus

Allotropes

NONE

-

Melting Point

-

Boiling Point

-

Automatic Ignition

-

Flashpoint

-

Critical Temperature

-

Critical Pressure

-

Thermal Conductivity

-

Thermal Expansion

-

Specific Heat

-

Heat Fusion

-

Heat Vaporisation

-

Heat Combustion

-

Curie Point

-

Neel Point

-

Adiabatic Index

Solid

Phase

-

Electrical Type

-

Conductivity

-

Resistivity

-

Superconducting Point

-

Magnetic Type

-

Mass Susceptibility

-

Molar Susceptibility

-

Volume Susceptibility

Material Composition

-

Universe

-

Meteorites

-

Sun

-

Earth Crust

-

Oceans

-

Humans

268.125'670'0

Atomic Weight

-

Atomic Radius

149 pm

Covalent Radius Single Bond

136 pm

Covalent Radius Double Bond

126 pm

Covalent Radius Triple Bond

139 pm

Van der Waals Radius

[Rn]7s²5f¹⁴6d³

Electron Configuration

Cubic, Body-centred

Crystal Structure

29.300'00 g/cm³

Density as Solid

-

Density as Liquid

-

Density as Gas

-

Space Group Name

-

Space Group Number

-

Lattice Angles

-

Lattice Constants

5.56 hours

Half Life

18.90 hours

Lifetime

6d³ = 6, 2, 0, +1/2

Quantum Numbers

-

Neutron Cross Section

-

Neutron Mass Absorption

Stable Isotopes

NONE

Unstable Isotopes

Isotopes Overview

Isotope	Stability	Symbol	Type	Protons		Neutrons		Spin	Parity	Mass		Abundance		Mass Measure	Mass Excess		Binding Energy		Dipole Moment	Quadrupole Moment	Halflife in Years		Halflife in Seconds		A01 Decay Probability		A01 Decay Mode	A01 Decay Energy		A01 Decay Daughter	A01 Decay Link	A02 Decay Mode	A02 Decay Energy		A02 Decay Daughter	A02 Decay Link	A03 Decay Probability		A03 Decay Mode	A03 Decay Energy		A03 Decay Daughter	A03 Decay Link	Y01 Decay Product Yield		Y01 Decay Product Nuclide	Y02 Decay Product Yield		Y02 Decay Product Nuclide	Y03 Decay Product Yield		Y03 Decay Product Nuclide	Y04 Decay Product Yield		Y04 Decay Product Nuclide	Y05 Decay Product Yield		Y05 Decay Product Nuclide	Y06 Decay Product Yield		Y06 Decay Product Nuclide	Y07 Decay Product Yield		Y07 Decay Product Nuclide	Y08 Decay Product Yield		Y08 Decay Product Nuclide	Y09 Decay Product Yield		Y09 Decay Product Nuclide	Y10 Decay Product Yield		Y10 Decay Product Nuclide	Y11 Decay Product Yield		Y11 Decay Product Nuclide	Y12 Decay Product Yield		Y12 Decay Product Nuclide
Isotope_105_db_255_u	Unstable	²⁵⁵Db	Boson	105	p	150	n	?	0	255.107'398'000'0	u	~ 0	%	~ 0	115.174'000'000'0	MeV	7.338'000'000'0	MeV	-	-	5.39E-8	year	1.700	seconds ( x⁰ )	80.000'000	%	α	9,720.000	keV	²⁵¹Lr	²⁵⁵Db > [ 80 % , α , 9,720.0 keV ] > ²⁵¹Lr	SF	?	keV	V	²⁵⁵Db > [ , SF , ? keV ] > V								?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb
Isotope_105_db_256_u	Unstable	²⁵⁶Db	Fermion	105	p	151	n	?	0	256.108'127'000'0	u	~ 0	%	~ 0	100.041'000'000'0	MeV	7.357'000'000'0	MeV	-	-	6.02E-8	year	1.900	seconds ( x⁰ )	36.000'000	%	β+	5,462.000	keV	²⁵⁶Rf	²⁵⁶Db > [ 36 % , β+ , 5,462.0 keV ] > ²⁵⁶Rf	SF	?	keV	V	²⁵⁶Db > [ , SF , ? keV ] > V	?	%	α	9,457.000	keV	²⁵²Lr	²⁵⁶Db > [ ? % , α , 9,457.0 keV ] > ²⁵²Lr	0.077'560	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_105_db_257_u	Unstable	²⁵⁷Db	Boson	105	p	152	n	9/2	1	257.107'722'000'0	u	~ 0	%	~ 0	100.720'000'000'0	MeV	7.357'000'000'0	MeV	-	-	4.85E-8	year	1.530	seconds ( x⁰ )	94.000'000	%	α	9,230.000	keV	²⁵³Lr	²⁵⁷Db > [ 94 % , α , 9,230.0 keV ] > ²⁵³Lr	SF	?	keV	V	²⁵⁷Db > [ , SF , ? keV ] > V	1.000'000	%	β+	3,386.000	keV	²⁵⁷Rf	²⁵⁷Db > [ 1 % , β+ , 3,386.0 keV ] > ²⁵⁷Rf	32.422'879	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_105_db_258_u	Unstable	²⁵⁸Db	Fermion	105	p	153	n	?	0	258.109'231'000'0	u	~ 0	%	~ 0	100.342'000'000'0	MeV	7.361'000'000'0	MeV	-	-	1.43E-7	year	4.500	seconds ( x⁰ )	64.000'000	%	α	9,476.000	keV	²⁵⁴Lr	²⁵⁸Db > [ 64 % , α , 9,476.0 keV ] > ²⁵⁴Lr	β+	4,326.000	keV	²⁵⁸Rf	²⁵⁸Db > [ , β+ , 4,326.0 keV ] > ²⁵⁸Rf	1.000'000	%	SF	?	keV	V	²⁵⁸Db > [ 1 % , SF , ? keV ] > V	23.401'794	%	²⁰⁶Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_105_db_259_u	Unstable	²⁵⁹Db	Boson	105	p	154	n	?	0	259.109'610'000'0	u	~ 0	%	~ 0	101.748'000'000'0	MeV	7.359'000'000'0	MeV	-	-	1.62E-8	year	510.000	milli-seconds ( x⁻³ )	100.000'000	%	α	9,618.000	keV	²⁵⁵Lr	²⁵⁹Db > [ 100 % , α , 9,618.0 keV ] > ²⁵⁵Lr													95.814'549	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁷⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_105_db_260_u	Unstable	²⁶⁰Db	Fermion	105	p	155	n	?	0	260.111'300'000'0	u	~ 0	%	~ 0	102.101'000'000'0	MeV	7.360'000'000'0	MeV	-	-	4.82E-8	year	1.520	seconds ( x⁰ )	90.400'000	%	α	9,378.400	keV	²⁵⁶Lr	²⁶⁰Db > [ 90.4 % , α , 9,378.4 keV ] > ²⁵⁶Lr	SF	?	keV	V	²⁶⁰Db > [ , SF , ? keV ] > V	2.500'000	%	β+	3,505.000	keV	²⁶⁰Rf	²⁶⁰Db > [ 2.5 % , β+ , 3,505.0 keV ] > ²⁶⁰Rf	90.549'799	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_105_db_261_u	Unstable	²⁶¹Db	Boson	105	p	156	n	?	0	261.112'056'000'0	u	~ 0	%	~ 0	103.676'000'000'0	MeV	7.357'000'000'0	MeV	-	-	5.70E-8	year	1.800	seconds ( x⁰ )	82.000'000	%	α	9,219.000	keV	²⁵⁷Lr	²⁶¹Db > [ 82 % , α , 9,219.0 keV ] > ²⁵⁷Lr	SF	?	keV	V	²⁶¹Db > [ , SF , ? keV ] > V								82.516'640	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_105_db_262_u	Unstable	²⁶²Db	Fermion	105	p	157	n	?	0	262.114'084'000'0	u	~ 0	%	~ 0	104.379'000'000'0	MeV	7.357'000'000'0	MeV	-	-	1.11E-6	year	34.980	seconds ( x⁰ )	67.000'000	%	α	9,005.000	keV	²⁵⁸Lr	²⁶²Db > [ 67 % , α , 9,005.0 keV ] > ²⁵⁸Lr	SF	?	keV	V	²⁶²Db > [ , SF , ? keV ] > V	3.000'000	%	β+	2,853.000	keV	²⁶²Rf	²⁶²Db > [ 3 % , β+ , 2,853.0 keV ] > ²⁶²Rf	63.678'141	%	²⁰⁶Pb	0.000'001	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_105_db_263_u	Unstable	²⁶³Db	Boson	105	p	158	n	?	0	263.114'988'000'0	u	~ 0	%	~ 0	106.269'000'000'0	MeV	7.352'000'000'0	MeV	-	-	9.18E-7	year	28.980	seconds ( x⁰ )	56.000'000	%	SF	?	keV	V	²⁶³Db > [ 56 % , SF , ? keV ] > V	α	8,834.000	keV	²⁵⁹Lr	²⁶³Db > [ , α , 8,834.0 keV ] > ²⁵⁹Lr	6.900'000	%	β+	1,252.000	keV	²⁶³Rf	²⁶³Db > [ 6.9 % , β+ , 1,252.0 keV ] > ²⁶³Rf	30.670'964	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁷⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_105_db_264_u	Unstable	²⁶⁴Db	Fermion	105	p	159	n	?	0	264.117'404'000'0	u	~ 0	%	~ 0	107.111'000'000'0	MeV	7.352'000'000'0	MeV	-	-	6.33E-6	year	199.800	seconds ( x⁰ )	?	%	α	8,660.000	keV	²⁶⁰Lr	²⁶⁴Db > [ ? % , α , 8,660.0 keV ] > ²⁶⁰Lr													?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_105_db_265_u	Unstable	²⁶⁵Db	Boson	105	p	160	n	?	0	265.118'601'000'0	u	~ 0	%	~ 0	109.361'000'000'0	MeV	7.346'000'000'0	MeV	-	-	2.85E-5	year	900.000	seconds ( x⁰ )	?	%	α	8,490.000	keV	²⁶¹Lr	²⁶⁵Db > [ ? % , α , 8,490.0 keV ] > ²⁶¹Lr													?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_105_db_266_u	Unstable	²⁶⁶Db	Fermion	105	p	161	n	?	0	266.121'029'000'0	u	~ 0	%	~ 0	110.476'000'000'0	MeV	7.344'000'000'0	MeV	-	-	3.80E-5	year	1.200	kilo-seconds ( x³ )	?	%	α	8,190.000	keV	²⁶²Lr	²⁶⁶Db > [ ? % , α , 8,190.0 keV ] > ²⁶²Lr	SF	?	keV	V	²⁶⁶Db > [ , SF , ? keV ] > V								?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_105_db_267_u	Unstable	²⁶⁷Db	Boson	105	p	162	n	?	0	267.122'377'000'0	u	~ 0	%	~ 0	112.738'000'000'0	MeV	7.339'000'000'0	MeV	-	-	2.21E-4	year	6.984	kilo-seconds ( x³ )	?	%	α	7,900.000	keV	²⁶³Lr	²⁶⁷Db > [ ? % , α , 7,900.0 keV ] > ²⁶³Lr	SF	?	keV	V	²⁶⁷Db > [ , SF , ? keV ] > V								?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_105_db_268_u	Unstable	²⁶⁸Db	Fermion	105	p	163	n	?	0	268.125'445'000'0	u	~ 0	%	~ 0	113.994'000'000'0	MeV	7.337'000'000'0	MeV	-	-	6.34E-4	year	20.016	kilo-seconds ( x³ )	?	%	α	8,200.000	keV	²⁶⁴Lr	²⁶⁸Db > [ ? % , α , 8,200.0 keV ] > ²⁶⁴Lr	SF	?	keV	V	²⁶⁸Db > [ , SF , ? keV ] > V								?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_105_db_269_u	Unstable	²⁶⁹Db	Boson	105	p	164	n	?	0	269.127'460'000'0	u	~ 0	%	~ 0	116.851'000'000'0	MeV	7.329'000'000'0	MeV	-	-	3.17E-4	year	10.008	kilo-seconds ( x³ )	?	%	α	8,400.000	keV	²⁶⁵Lr	²⁶⁹Db > [ ? % , α , 8,400.0 keV ] > ²⁶⁵Lr	SF	?	keV	V	²⁶⁹Db > [ , SF , ? keV ] > V								?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_105_db_270_u	Unstable	²⁷⁰Db	Fermion	105	p	165	n	?	0	270.130'712'000'0	u	~ 0	%	~ 0	118.728'000'000'0	MeV	7.325'000'000'0	MeV	-	-	1.27E-4	year	3.996	kilo-seconds ( x³ )	?	%	α	8,200.000	keV	²⁶⁶Lr	²⁷⁰Db > [ ? % , α , 8,200.0 keV ] > ²⁶⁶Lr	SF	?	keV	V	²⁷⁰Db > [ , SF , ? keV ] > V								?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb

105 – Dubnium, Db

105 – Dubnium, Db

105 – Dubnium, Db

105 – Dubnium, Db

105 – Dubnium, Db

Spectrograph

Elemental Tile

Dubnium

Spectrograph

Elemental Tile

Dubnium

Spectrograph

Elemental Tile

Dubnium

Spectrograph

Elemental Tile

Dubnium

Spectrograph

Elemental Tile

Dubnium