Dubnium (Db)

Dubnium is the 105th element in the periodic table and has a symbol of Db and atomic number of 105. It has an atomic weight of (268) and a mass number of 255. Dubnium has one hundred five protons and one hundred fifty neutrons in its nucleus, and one hundred five electrons in seven shells. It is located in group five, period seven and block d of the periodic table. Also known as Hahnium, Ha. Radioactive transactinide element. Half-life of 1.6s. Discovered in 1970 by Berkeley researchers. So far, seven isotopes have been discovered.

Atomic Number	105
Atomic Weight	268
Mass Number	255

Group	5
Period	7
Block	d

Protons	105 p⁺
Neutrons	150 n⁰
Electrons	105 e^-

Physical Properties

Atomic Radius
Molar Volume
Covalent Radius	149 pm 136 pm 126 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density	29.3 g/cm³

Chemical Properties

Energy

Proton Affinity
Electron Affinity
Ionization Energy	6.8 eV/particle 14 eV/particle 23.1 eV/particle 33 eV/particle 43 eV/particle 86 eV/particle 98.9 eV/particle 126 eV/particle 145 eV/particle 172 eV/particle 196 eV/particle 220.9 eV/particle 254 eV/particle 274 eV/particle 307 eV/particle 838 eV/particle 872 eV/particle 908 eV/particle 948 eV/particle 985 eV/particle 1,022 eV/particle 1,089 eV/particle 1,126 eV/particle 1,168 eV/particle 1,207 eV/particle 3,975 eV/particle 4,057 eV/particle 4,145 eV/particle 4,237 eV/particle 4,326 eV/particle 4,411 eV/particle 4,620 eV/particle 4,710 eV/particle 4,810 eV/particle 4,900 eV/particle 5,260 eV/particle 5,350 eV/particle 5,450 eV/particle 5,530 eV/particle 6,280 eV/particle 6,380 eV/particle 6,650 eV/particle 6,760 eV/particle 10,420 eV/particle 10,610 eV/particle 10,820 eV/particle 11,040 eV/particle 11,240 eV/particle 11,440 eV/particle 12,040 eV/particle 12,250 eV/particle 12,480 eV/particle 12,700 eV/particle 13,300 eV/particle 13,500 eV/particle 13,700 eV/particle 13,900 eV/particle 16,200 eV/particle 16,400 eV/particle 16,900 eV/particle 17,100 eV/particle 33,800 eV/particle 34,300 eV/particle 34,800 eV/particle 35,300 eV/particle 43,800 eV/particle 44,500 eV/particle 45,400 eV/particle 181,444 eV/particle

Heat of Vaporization
Heat of Fusion
Heat of Formation
Electrons

Electron Shells	2, 8, 18, 32, 32, 11, 2

Valence Electrons	2 ⓘ

Electron Configuration	[Rn] 5f¹⁴ 6d³ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹⁴ 6d³ 7s²

Oxidation States	5
Electronegativity
Electrophilicity Index
States of Matter

Phase	Solid
Gas Phase
Boiling Point
Melting Point
Critical Pressure
Critical Temperature
Triple Point
Visual
Dubnium is a Colorless. Db has a Jmol of #d1004f.
Color	Colorless #d1004f
Appearance
Refractive Index
Thermodynamic Properties
Thermal Conductivity
Thermal Expansion
Molar Heat Capacity
Specific Heat Capacity
Heat Capacity Ratio (Adiabatic Index)
Electrical Properties
Type
Electrical Conductivity
Electrical Resistivity
Superconducting Point
Magnetism
Type
Magnetic Susceptibility (Mass)
Magnetic Susceptibility (Molar)
Magnetic Susceptibility (Volume)
Magnetic Ordering
Curie Point
Neel Point
Structure
The lattice angles of Dubnium is .
Crystal Structure	()
Lattice Constant
Lattice Angles
Mechanical Properties

Hardness
Bulk Modulus
Shear Modulus
Young's Modulus
Poisson Ratio
Speed of Sound
Classification
The CAS Group of Dubnium is VA. The IUPAC Group of Db is VB. The Mendeleev Number of Element 105 is 50. The Goldschmidt Class of Dubnium (Db) is synthetic.
Category	Transition metals, Transition metals
CAS Group	VA
IUPAC Group	VB
Glawe Number
Mendeleev Number	50
Pettifor Number
Geochemical Class
Goldschmidt Class	synthetic

Other

The Dipole Polarizability of Dubnium is 42 plus or minus 4 a₀. The Allotropes of Db is . The Quantum Numbers of Element 105 is 4F3/2. The Space Group of Dubnium (Db) is ().

Gas Basicity
Dipole Polarizability	42 ± 4 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers	4F3/2
Space Group	()

Isotopes of Dubnium

Stable Isotopes	0
Unstable Isotopes	16
Natural Isotopes	0

²⁵⁵Db

Mass Number	255
Neutron Number	150
Relative Atomic Mass	255.106919 ± 0.000304 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	54 ms
Spin	9/2
Quadrupole Moment
Discovery Year	1976
Parity	+

Decay Mode	Intensity
SF (spontaneous fission)	67%
α (α emission)

²⁵⁶Db

Mass Number	256
Neutron Number	151
Relative Atomic Mass	256.107674 ± 0.000201 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	1.7 ± 0.4 s
Spin	9
Quadrupole Moment
Discovery Year	2001
Parity	-

Decay Mode	Intensity
α (α emission)	70%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	30%
SF (spontaneous fission)

²⁵⁷Db

Mass Number	257
Neutron Number	152
Relative Atomic Mass	257.107520042 ± 0.000176741 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	2.3 ± 0.2 s
Spin	9/2
Quadrupole Moment
Discovery Year	1985
Parity	+

Decay Mode	Intensity
α (α emission)	94%
SF (spontaneous fission)	6%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁵⁸Db

Mass Number	258
Neutron Number	153
Relative Atomic Mass	258.108972995 ± 0.000098613 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	2.17 ± 0.36 s
Spin	0
Quadrupole Moment	0
Discovery Year	1985
Parity	-

Decay Mode	Intensity
α (α emission)	64%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	36%

²⁵⁹Db

Mass Number	259
Neutron Number	154
Relative Atomic Mass	259.109491859 ± 0.000060854 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	510 ± 160 ms
Spin	9/2
Quadrupole Moment
Discovery Year	2001
Parity	+

Decay Mode	Intensity
α (α emission)	100%

²⁶⁰Db

Mass Number	260
Neutron Number	155
Relative Atomic Mass	260.111297 ± 0.0001 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	1.52 ± 0.13 s
Spin
Quadrupole Moment
Discovery Year	1970
Parity

Decay Mode	Intensity
α (α emission)	90.4%
SF (spontaneous fission)	9.6%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁶¹Db

Mass Number	261
Neutron Number	156
Relative Atomic Mass	261.111979 ± 0.000118 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	4.7 ± 1 s
Spin	9/2
Quadrupole Moment
Discovery Year	1970
Parity	+

Decay Mode	Intensity
SF (spontaneous fission)	73%
α (α emission)	27%

²⁶²Db

Mass Number	262
Neutron Number	157
Relative Atomic Mass	262.114067 ± 0.000154 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	34 ± 4 s
Spin
Quadrupole Moment
Discovery Year	1971
Parity

Decay Mode	Intensity
SF (spontaneous fission)	52%
α (α emission)	48%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁶³Db

Mass Number	263
Neutron Number	158
Relative Atomic Mass	263.114987 ± 0.00018 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	29 ± 9 s
Spin	9/2
Quadrupole Moment
Discovery Year	1992
Parity	+

Decay Mode	Intensity
SF (spontaneous fission)	56%
α (α emission)	37%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	6.9%

²⁶⁴Db

Mass Number	264
Neutron Number	159
Relative Atomic Mass	264.117297 ± 0.000253 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)

²⁶⁵Db

Mass Number	265
Neutron Number	160
Relative Atomic Mass	265.1185 ± 0.00024 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	9/2
Quadrupole Moment
Discovery Year
Parity	+

Decay Mode	Intensity
α (α emission)

²⁶⁶Db

Mass Number	266
Neutron Number	161
Relative Atomic Mass	266.121032 ± 0.000304 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	80 ± 70 m
Spin
Quadrupole Moment
Discovery Year	2007
Parity

Decay Mode	Intensity
α (α emission)
SF (spontaneous fission)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁶⁷Db

Mass Number	267
Neutron Number	162
Relative Atomic Mass	267.122399 ± 0.000402 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	2 ± 1.1 h
Spin	9/2
Quadrupole Moment
Discovery Year	2004
Parity	+

Decay Mode	Intensity
SF (spontaneous fission)	100%

²⁶⁸Db

Mass Number	268
Neutron Number	163
Relative Atomic Mass	268.125669 ± 0.000568 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	29 ± 3 h
Spin
Quadrupole Moment
Discovery Year	2004
Parity

Decay Mode	Intensity
SF (spontaneous fission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)

²⁶⁹Db

Mass Number	269
Neutron Number	164
Relative Atomic Mass	269.127911 ± 0.000669 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	9/2
Quadrupole Moment
Discovery Year
Parity	+

Decay Mode	Intensity
α (α emission)
SF (spontaneous fission)

²⁷⁰Db

Mass Number	270
Neutron Number	165
Relative Atomic Mass	270.131399 ± 0.000617 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	1.7 ± 1 h
Spin
Quadrupole Moment
Discovery Year	2010
Parity

Decay Mode	Intensity
SF (spontaneous fission)	87%
α (α emission)	13%

History

Dubnium was reportedly first discovered in 1968 at the Joint Institute for Nuclear Research at Dubna. Researchers there bombarded an americium-243 target with neon-22 ions. In the same year, a team led by Albert Ghiorso working at the University of California, Berkeley conclusively synthesized the element by bombarding a californium-249 target with nitrogen-15 ions. Named after the Russian town of Dubna

Discoverers	A. Ghiorso, et al
Discovery Location	United States
Discovery Year	1970
Etymology (Name Origin)	Named after the city of Dubna, the site of the JINR.
Pronunciation	HA-ni-em (English)

Dubnium is harmful due to its radioactivity

The Berkeley team proposed the name hahnium for the element

Uses

Dubnium is used for scientific research purposes only. It has no significant commercial applications.

Sources

Made by bombarding californium-249 with a beam of nitrogen-15

Abundance
Abundance in Earth's crust
Natural Abundance (Oceans)
Natural Abundance (Human Body)	0 %
Natural Abundance (Meteor)	0 %
Natural Abundance (Sun)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Also Known As

Db
element 105
hahnium
unnilpentium
Unp

Translations

Norwegian Bokmåldubnium
Frenchdubnium
Norwegian Nynorskdubnium
Danishdubnium
Swedishdubnium
GermanDubnium
Hungariandubnium
Dutchdubnium
Amharicዱብኒየም
AragoneseDubnio
Arabicدوبنيوم
AzerbaijaniDubnium
BelarusianДубній
Bulgarianдубний
Banglaডুবনিয়াম
Bosniandubnij
Catalandubni
CorsicanDubniu
Czechdubnium
ChuvashДубни
WelshDubniwm
Greekντούμπνιο
Esperantodubnio
Spanishdubnio
Estoniandubnium
Basquedubnio
Persianدوبنیم
Finnishdubnium
FriulianDubni
Irishdúibniam
ManxDubnium
Hakka Chinesedubnium
Hebrewדובניום
Fiji HindiDubnium
Croatiandubnij
Armenianդուբնիում
Interlinguadubnium
Indonesiandubnium
Idodubnio
Italiandubnio
Japaneseドブニウム
Lojbanjinmrdubni
JavaneseDubnium
Kannadaಡುಬ್ನಿಯಮ್
Korean더브늄
KurdishDubniyûm
KomiДубний
Latindubnium
LuxembourgishDubnium
LigurianDubnio
Lithuaniandubnis
Latviandubnijs
Malayalamഡൂബ്നിയം
Marathiडब्नियम
Western MariДубний
MalayDubnium
Polishdubn
Portuguesedúbnio
QuechuaDubniyu
Romaniandubniu
Russianдубний
Siciliandubniu
Serbo-CroatianDubnijum
Slovakdubnium
Sloveniandubnij
Albaniandubniumi
Serbianдубнијум
Saterland FrisianDubnium
Thaiดุบเนียม
Turkishdubniyum
Uyghurدۇبنىي
Ukrainianдубній
Urduڈبنئیم
VepsDubnii
Vietnamesedubni
WarayDubnyo
KalmykДубниум
YorubaDubnium
Chinese𨧀
GalicianDubnio
German (Switzerland)Dubnium
English (Canada)Dubnium
English (United Kingdom)dubnium
Portuguese (Brazil)dúbnio
Cantonese𨧀
BretonDubniom
CebuanoDubnyum
Macedonianдубниум
Central Kurdishدوبنیۆم
Western Panjabiڈبنئیم
KazakhДубний
Odiaଡବ୍‌ନିଅମ
Gujaratiડૂબનીયમ
Occitandubni
Tatarдубний
Tamilதூப்னியம்
Newariडब्नियम
SomaliDubniyaam
Belarusian (Taraskievica orthography)Дубн
Chinese (China)𬭊
Chinese (Traditional)𨧀
Chinese (Taiwan)𨧀
Chinese (Simplified)𬭊
AromanianDubniu
UzbekDubniy
KyrgyzДубний
Nepaliदुब्नियम
LimburgishDubnium
Hindiडब्नियम
Sanskritडब्नियम
Maltesedubnju
Paliडब्नियम
Scottish GaelicDubnium
Bhojpuriडब्नियम
Teluguడుబ్నియం
cdoDubnium
Min Nan ChineseDubnium
AsturianDubniu
Chinese (Macao SAR China)𨧀
Chinese (Hong Kong SAR China)𨧀
Chinese (Malaysia)𬭊
Chinese (Singapore)𬭊
Tibetanཌབ་ནིམ།
Literary Chinese𨧀
TagalogDubniyo
kbpDʊbɩnɩyɔm
AfrikaansDubnium
Lingua Franca Novadubnio
Northern FrisianDubnium
Mongolianдубни
Georgianდუბნიუმი
Volapükdubnin
Icelandicdubnín
Low GermanDubnium
TajikДубний
SwahiliDubni
Wu Chinese𬭊
SardinianDùbniu
Burmeseဒပ်ဘ်နီယမ်
Moroccan Arabicدابنيوم
BashkirДубний
Egyptian Arabicدوبنيوم
Pashtoډوبنيوم
CornishDubniom
BalineseDubnium
BikolDubnyo

Dubnium on ChemicalAid

Australian Educational Vocabulary ID	scot/3514
CAS Registry Number	53850-35-4
DSSTOX compound identifier	DTXCID801323011
DSSTox substance ID	DTXSID30893063
Den Store Danske ID	dubnium
ECHA Substance Infocard ID	100.126.367
Elhuyar ZTH ID	064402
Encyclopedia of China (Third Edition) ID	185643
Encyclopædia Britannica Online ID	science/dubnium
Freebase ID	/m/0274b33
GND ID	4293095-9
Gran Enciclopèdia Catalana ID	0272492
Great Russian Encyclopedia Online ID	1969523
KBpedia ID	Dubnium
NKCR AUT ID	ph928215
OmegaWiki Defined Meaning	157650
Store norske leksikon ID	dubnium
Treccani ID	dubnio
USGS Thesaurus ID	1442

Dubnium (Db)

Physical Properties

Chemical Properties

Other

Isotopes of Dubnium

255Db

256Db

257Db

258Db

259Db

260Db

261Db

262Db

263Db

264Db

265Db

266Db

267Db

268Db

269Db

270Db