Berkelium (Bk)

grundstof med atomnummer 97

Atomnummer	97
Atommasse	247
mass number	233

Gruppe
Periode	7
Blok	f

proton	97 p⁺
neutron	136 n⁰
elektron	97 e^-

Animated Bohrs atommodel of Bk (Berkelium)

Fysisk Egenskab

Atomradius
molar volume
Kovalent Radius	168 pm 139 pm
Metallic Radius
Ionisk radius	96 pm 83 pm 93 pm 113,7 pm
Crystal Radius	110 pm 97 pm 107 pm 127,7 pm
Van der Waals-radius	244 pm 333,9 pm
massefylde	14,78 g/cm³

Kemisk Egenskab

{ERROR}

energi

proton affinity
electron affinity
ioniseringsenergi	6,1978 eV/particle 11,9 eV/particle 21,6 eV/particle 36 eV/particle 56 eV/particle 70,1 eV/particle 90 eV/particle 114 eV/particle 130 eV/particle 147 eV/particle 171 eV/particle 195 eV/particle 218 eV/particle 240 eV/particle 259 eV/particle 279 eV/particle 303 eV/particle 339 eV/particle 361 eV/particle 497 eV/particle 526 eV/particle 557 eV/particle 590 eV/particle 621 eV/particle 652 eV/particle 700 eV/particle 733 eV/particle 768 eV/particle 800 eV/particle 960 eV/particle 1.000 eV/particle 1.040 eV/particle 1.080 eV/particle 1.200 eV/particle 1.240 eV/particle 1.360 eV/particle 1.410 eV/particle 1.550 eV/particle 1.630 eV/particle 1.720 eV/particle 1.800 eV/particle 1.890 eV/particle 1.970 eV/particle 2.050 eV/particle 2.140 eV/particle 2.240 eV/particle 2.320 eV/particle 2.410 eV/particle 2.490 eV/particle 2.580 eV/particle 2.670 eV/particle 3.080 eV/particle 3.154 eV/particle 3.232 eV/particle 3.315 eV/particle 3.393 eV/particle 3.469 eV/particle 3.630 eV/particle 3.709 eV/particle 3.797 eV/particle 3.877 eV/particle 4.202 eV/particle 4.281 eV/particle 4.365 eV/particle 4.445 eV/particle 4.940 eV/particle 5.040 eV/particle 5.270 eV/particle 5.360 eV/particle 8.500 eV/particle 8.670 eV/particle 8.850 eV/particle 9.050 eV/particle 9.240 eV/particle 9.420 eV/particle 9.880 eV/particle 10.070 eV/particle 10.280 eV/particle 10.480 eV/particle 11.020 eV/particle 11.190 eV/particle 11.380 eV/particle 11.540 eV/particle 13.090 eV/particle 13.300 eV/particle 13.720 eV/particle 13.910 eV/particle 28.380 eV/particle 28.800 eV/particle 29.300 eV/particle 29.800 eV/particle 35.500 eV/particle 36.200 eV/particle 37.000 eV/particle 37.457,6 eV/particle 146.904,7 eV/particle 149.398 eV/particle

Fordampningsvarme
smeltevarme
standard enthalpy of formation	310 kJ/mol
elektron

Elektronskal	2, 8, 18, 32, 27, 8, 2

Valenselektron	2 ⓘ

electron configuration	[Rn] 5f⁹ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f⁹ 7s²

Oxidationstrin	2, 3, 4, 5
Elektronegativitet	0.19315
Electrophilicity Index
fundamental state of matter

stoffase
gaseous state of matter
Kogepunkt
Smeltepunkt	1.259,15 K
critical pressure
critical temperature
trippelpunkt
appearance
farve	Sort #ffffff #8a4fe3 #8a4fe3
appearance	silvery
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	π/2, π/2, 2 π/3
mechanical property
hårdhed
Kompressibilitetsmodul
Forskydningsmodul
E-modul
Poissons forhold
speed of sound
klassificering
Kategori	Actinider, Actinides
CAS Group
IUPAC Group
Glawe Number	41
Mendeleev Number	30
Pettifor Number	40
Geochemical Class
Goldschmidt classification	synthetic

øvrige

Gas Basicity
polarizability	125 ± 25 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	710
Neutron Mass Absorption
quantum number	6H15/2
rumgruppe	194 (P63/mmc)

Isotopes of Berkelium

Stable Isotopes	0
Unstable Isotopes	22
Natural Isotopes	0

²³³Bk

mass number	233
neutron number	136
Relative Atomic Mass	233,056652 ± 0,00025 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	40 ± 30 s
spin	3/2
nuclear quadrupole moment
opdagelsesdato	2015
Paritet	-

decay mode	Intensitet
α (α emission)	82%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²³⁴Bk

mass number	234
neutron number	137
Relative Atomic Mass	234,057322 ± 0,000164 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	20 ± 5 s
spin	3
nuclear quadrupole moment
opdagelsesdato	2003
Paritet	-

decay mode	Intensitet
α (α emission)	80%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	20%

²³⁵Bk

mass number	235
neutron number	138
Relative Atomic Mass	235,056651 ± 0,00043 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	3/2
nuclear quadrupole moment
opdagelsesdato
Paritet	-

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)

²³⁶Bk

mass number	236
neutron number	139
Relative Atomic Mass	236,057479 ± 0,000387 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	26 ± 10 s
spin	4
nuclear quadrupole moment
opdagelsesdato	2017
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)
β⁺ SF (β⁺-delayed fission)	0.04%

²³⁷Bk

mass number	237
neutron number	140
Relative Atomic Mass	237,057123 ± 0,000247 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	3/2
nuclear quadrupole moment
opdagelsesdato
Paritet	-

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)

²³⁸Bk

mass number	238
neutron number	141
Relative Atomic Mass	238,058204 ± 0,000275 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,4 ± 0,08 m
spin	1
nuclear quadrupole moment
opdagelsesdato	1994
Paritet

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)
β⁺ SF (β⁺-delayed fission)	0.048%

²³⁹Bk

mass number	239
neutron number	142
Relative Atomic Mass	239,058239 ± 0,000222 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1989
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0.01%
SF (spontaneous fission)	0.01%

²⁴⁰Bk

mass number	240
neutron number	143
Relative Atomic Mass	240,059758 ± 0,000161 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,8 ± 0,8 m
spin	7
nuclear quadrupole moment
opdagelsesdato	1980
Paritet	-

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)
β⁺ SF (β⁺-delayed fission)	0.002%

²⁴¹Bk

mass number	241
neutron number	144
Relative Atomic Mass	241,060098 ± 0,000178 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,6 ± 0,4 m
spin	7/2
nuclear quadrupole moment
opdagelsesdato	2003
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)

²⁴²Bk

mass number	242
neutron number	145
Relative Atomic Mass	242,061999 ± 0,000144 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	7 ± 1,3 m
spin	3
nuclear quadrupole moment
opdagelsesdato	1972
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ SF (β⁺-delayed fission)	3%
α (α emission)

²⁴³Bk

mass number	243
neutron number	146
Relative Atomic Mass	243,063005905 ± 0,000004856 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,6 ± 0,2 h
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1950
Paritet	-

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0.15%

²⁴⁴Bk

mass number	244
neutron number	147
Relative Atomic Mass	244,065178969 ± 0,000015457 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	5,02 ± 0,03 h
spin	4
nuclear quadrupole moment
opdagelsesdato	1972
Paritet	-

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)	0.006%

²⁴⁵Bk

mass number	245
neutron number	148
Relative Atomic Mass	245,066359814 ± 0,000001923 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,95 ± 0,03 d
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1951
Paritet	-

decay mode	Intensitet
ϵ (electron capture)	99.88%
α (α emission)	0.12%

²⁴⁶Bk

mass number	246
neutron number	149
Relative Atomic Mass	246,0686713 ± 0,000064433 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,8 ± 0,02 d
spin	2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)

²⁴⁷Bk

mass number	247
neutron number	150
Relative Atomic Mass	247,070305889 ± 0,00000557 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,38 ± 0,25 ky
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1965
Paritet	-

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)

²⁴⁸Bk

mass number	248
neutron number	151
Relative Atomic Mass	248,073141689 ± 0,000053739 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	6
nuclear quadrupole moment
opdagelsesdato	1956
Paritet	+

decay mode	Intensitet
α (α emission)
ϵ (electron capture)

²⁴⁹Bk

mass number	249
neutron number	152
Relative Atomic Mass	249,074983118 ± 0,000001339 Da
g-factor	0,57142857142857 ± 0,11428571428571
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	327,2 ± 0,3 d
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
α (α emission)	0.00145%
SF (spontaneous fission)	47%

²⁵⁰Bk

mass number	250
neutron number	153
Relative Atomic Mass	250,078317195 ± 0,00000311 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	3,212 ± 0,005 h
spin	2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁵¹Bk

mass number	251
neutron number	154
Relative Atomic Mass	251,080760555 ± 0,000011523 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	55,6 ± 1,1 m
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1967
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁵²Bk

mass number	252
neutron number	155
Relative Atomic Mass	252,08431 ± 0,000215 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,8 ± 0,5 m
spin
nuclear quadrupole moment
opdagelsesdato	1988
Paritet

decay mode	Intensitet
β⁻ (β⁻ decay)
α (α emission)

²⁵³Bk

mass number	253
neutron number	156
Relative Atomic Mass	253,08688 ± 0,000385 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1991
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)

²⁵⁴Bk

mass number	254
neutron number	157
Relative Atomic Mass	254,0906 ± 0,00032 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin
nuclear quadrupole moment
opdagelsesdato
Paritet

decay mode	Intensitet
β⁻ (β⁻ decay)

historie

opdager eller opfinder	G.T.Seaborg, S.G.Tompson, A.Ghiorso
fundsted	United States
opdagelsesdato	1949
etymologi	Named after Berkeley, California the city of its discovery.
udtale	BURK-li-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

Berkelium on ChemicalAid

Berkelium (Bk)

Fysisk Egenskab

Kemisk Egenskab

øvrige

Isotopes of Berkelium

233Bk

234Bk

235Bk

236Bk

237Bk

238Bk

239Bk

240Bk

241Bk

242Bk

243Bk

244Bk

245Bk

246Bk

247Bk

248Bk

249Bk

250Bk

251Bk

252Bk

253Bk

254Bk

historie

source

Nuclear Screening Constants

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²⁴⁷Bk

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