Dubnium (Db)

grundstof med atomnummer 105

Atomnummer	105
Atommasse	268
mass number	255

Gruppe	5
Periode	7
Blok	d

proton	105 p⁺
neutron	150 n⁰
elektron	105 e^-

Animated Bohrs atommodel of Db (Dubnium)

Fysisk Egenskab

Atomradius
molar volume
Kovalent Radius	149 pm 136 pm 126 pm
Metallic Radius
Ionisk radius
Crystal Radius
Van der Waals-radius
massefylde	29,3 g/cm³

Kemisk Egenskab

{ERROR}

energi

proton affinity
electron affinity
ioniseringsenergi	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

Fordampningsvarme
smeltevarme
standard enthalpy of formation
elektron

Elektronskal	2, 8, 18, 32, 32, 11, 2

Valenselektron	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

Oxidationstrin	5
Elektronegativitet
Electrophilicity Index
fundamental state of matter

stoffase
gaseous state of matter
Kogepunkt
Smeltepunkt
critical pressure
critical temperature
trippelpunkt
appearance
farve	Sort #d1004f
appearance
Brydningsindeks
materialeegenskab
Varmeledningsevne
Termisk ekspansion
molar heat capacity
Varmefylde
Adiabateksponenten
electrical properties
type
specifik ledningsevne
Elektrisk resistivitet
superledning
Magnetisme
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curietemperaturen
Néel temperature
struktur
Krystalstruktur	{ERROR}
lattice constant
Lattice Angles
mechanical property
hårdhed
Kompressibilitetsmodul
Forskydningsmodul
E-modul
Poissons forhold
speed of sound
klassificering
Kategori	Actinider, Transition metals
CAS Group	VA
IUPAC Group	VB
Glawe Number
Mendeleev Number	50
Pettifor Number
Geochemical Class
Goldschmidt classification	synthetic

øvrige

Gas Basicity
polarizability	42 ± 4 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
Neutron Mass Absorption
quantum number	4F3/2
rumgruppe	()

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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	54 ms
spin	9/2
nuclear quadrupole moment
opdagelsesdato	1976
Paritet	+

decay mode	Intensitet
SF (spontaneous fission)	67%
α (α emission)

²⁵⁶Db

mass number	256
neutron number	151
Relative Atomic Mass	256,107674 ± 0,000201 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,7 ± 0,4 s
spin	9
nuclear quadrupole moment
opdagelsesdato	2001
Paritet	-

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,3 ± 0,2 s
spin	9/2
nuclear quadrupole moment
opdagelsesdato	1985
Paritet	+

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,17 ± 0,36 s
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1985
Paritet	-

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	510 ± 160 ms
spin	9/2
nuclear quadrupole moment
opdagelsesdato	2001
Paritet	+

decay mode	Intensitet
α (α emission)	100%

²⁶⁰Db

mass number	260
neutron number	155
Relative Atomic Mass	260,111297 ± 0,0001 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,52 ± 0,13 s
spin
nuclear quadrupole moment
opdagelsesdato	1970
Paritet

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,7 ± 1 s
spin	9/2
nuclear quadrupole moment
opdagelsesdato	1970
Paritet	+

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	34 ± 4 s
spin
nuclear quadrupole moment
opdagelsesdato	1971
Paritet

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	29 ± 9 s
spin	9/2
nuclear quadrupole moment
opdagelsesdato	1992
Paritet	+

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin
nuclear quadrupole moment
opdagelsesdato
Paritet

decay mode	Intensitet
α (α emission)

²⁶⁵Db

mass number	265
neutron number	160
Relative Atomic Mass	265,1185 ± 0,00024 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	9/2
nuclear quadrupole moment
opdagelsesdato
Paritet	+

decay mode	Intensitet
α (α emission)

²⁶⁶Db

mass number	266
neutron number	161
Relative Atomic Mass	266,121032 ± 0,000304 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	80 ± 70 m
spin
nuclear quadrupole moment
opdagelsesdato	2007
Paritet

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2 ± 1,1 h
spin	9/2
nuclear quadrupole moment
opdagelsesdato	2004
Paritet	+

decay mode	Intensitet
SF (spontaneous fission)	100%

²⁶⁸Db

mass number	268
neutron number	163
Relative Atomic Mass	268,125669 ± 0,000568 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	29 ± 3 h
spin
nuclear quadrupole moment
opdagelsesdato	2004
Paritet

decay mode	Intensitet
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
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	9/2
nuclear quadrupole moment
opdagelsesdato
Paritet	+

decay mode	Intensitet
α (α emission)
SF (spontaneous fission)

²⁷⁰Db

mass number	270
neutron number	165
Relative Atomic Mass	270,131399 ± 0,000617 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,7 ± 1 h
spin
nuclear quadrupole moment
opdagelsesdato	2010
Paritet

decay mode	Intensitet
SF (spontaneous fission)	87%
α (α emission)	13%

historie

opdager eller opfinder	A. Ghiorso, et al
fundsted	United States
opdagelsesdato	1970
etymologi	Named after the city of Dubna, the site of the JINR.
udtale	HA-ni-em (engelsk)

source

Forekomst
Abundance in Earth's crust
natural abundance (verdenshave)
natural abundance (menneskelige krop)	0 %
natural abundance (Meteoroid)	0 %
natural abundance (Solen)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Dubnium on ChemicalAid

Dubnium (Db)

Fysisk Egenskab

Kemisk Egenskab

øvrige

Isotopes of Dubnium

255Db

256Db

257Db

258Db

259Db

260Db

261Db

262Db

263Db

264Db

265Db

266Db

267Db

268Db

269Db

270Db

historie

source

Nuclear Screening Constants

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²⁷⁰Db