Bekelu (Bk)

element with the atomic number of 97

Atomic Number	97
Atomic Weight	247
mass number	233

Group
Period	7
Block	f

Proton	97 p⁺
Netron	136 n⁰
Eléktron	97 e^-

Physical Property

Atomic Radius
molar volume
covalent radius	168 pm 139 pm
Metallic Radius
ionic 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
density	14,78 g/cm³

Chemical Property

molungé

proton affinity
electron affinity
ionization energy	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

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation	310 kJ/mol
Eléktron

electron shell	2, 8, 18, 32, 27, 8, 2

valence electron	2 ⓘ

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

oxidation number	2, 3, 4, 5
electronegativity	0.19315
Electrophilicity Index
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point
Melting Point	1.259,15 K
critical pressure
critical temperature
triple point
appearance
Lángi	Colorless #ffffff #8a4fe3 #8a4fe3
appearance	silvery
refractive index
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
electrical conductivity
electrical resistivity
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal Structure	Simple Hexagonal ()
lattice constant
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
Category	Actinides, Actinides
CAS Group
IUPAC Group
Glawe Number	41
Mendeleev Number	30
Pettifor Number	40
Geochemical Class
Goldschmidt classification	synthetic

other

Gas Basicity
polarizability	125 ± 25 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	710
Neutron Mass Absorption
quantum number	6H15/2
space group	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
radioactivity	☢️ radioactive element
half-life	40 ± 30 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	2015
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	20 ± 5 s
spin	3
nuclear quadrupole moment
time of discovery or invention	2003
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life
spin	3/2
nuclear quadrupole moment
time of discovery or invention
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	26 ± 10 s
spin	4
nuclear quadrupole moment
time of discovery or invention	2017
parity	+

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life
spin	3/2
nuclear quadrupole moment
time of discovery or invention
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	2,4 ± 0,08 m
spin	1
nuclear quadrupole moment
time of discovery or invention	1994
parity

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1989
parity	+

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	4,8 ± 0,8 m
spin	7
nuclear quadrupole moment
time of discovery or invention	1980
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	4,6 ± 0,4 m
spin	7/2
nuclear quadrupole moment
time of discovery or invention	2003
parity	+

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	7 ± 1,3 m
spin	3
nuclear quadrupole moment
time of discovery or invention	1972
parity	+

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	4,6 ± 0,2 h
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1950
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	5,02 ± 0,03 h
spin	4
nuclear quadrupole moment
time of discovery or invention	1972
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	4,95 ± 0,03 d
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1951
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	1,8 ± 0,02 d
spin	2
nuclear quadrupole moment
time of discovery or invention	1954
parity

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	1,38 ± 0,25 ky
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1965
parity	-

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life
spin	6
nuclear quadrupole moment
time of discovery or invention	1956
parity	+

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	327,2 ± 0,3 d
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1954
parity	+

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life	3,212 ± 0,005 h
spin	2
nuclear quadrupole moment
time of discovery or invention	1954
parity	-

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

²⁵¹Bk

mass number	251
neutron number	154
Relative Atomic Mass	251,080760555 ± 0,000011523 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	55,6 ± 1,1 m
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1967
parity	-

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

²⁵²Bk

mass number	252
neutron number	155
Relative Atomic Mass	252,08431 ± 0,000215 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	1,8 ± 0,5 m
spin
nuclear quadrupole moment
time of discovery or invention	1988
parity

decay mode	intensity
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
radioactivity	☢️ radioactive element
half-life
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1991
parity	-

decay mode	intensity
β⁻ (β⁻ decay)

²⁵⁴Bk

mass number	254
neutron number	157
Relative Atomic Mass	254,0906 ± 0,00032 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin
nuclear quadrupole moment
time of discovery or invention
parity

decay mode	intensity
β⁻ (β⁻ decay)

lisoló

discoverer or inventor	G.T.Seaborg, S.G.Tompson, A.Ghiorso
location of discovery	United States
time of discovery or invention	1949
etymology	Named after Berkeley, California the city of its discovery.
pronunciation	BURK-li-em (lingɛlɛ́sa)

source

Abundance
Abundance in Earth's crust
natural abundance (ocean)
natural abundance (human body)	0 %
natural abundance (meteoroid)	0 %
natural abundance (Mói)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Bekelu on ChemicalAid

berkelium

Australian Educational Vocabulary ID	scot/2377
CAS Registry Number	7440-40-6
ChEBI ID	33391
ChemSpider ID	22409
DSSTOX compound identifier	DTXCID20147880
DSSTox substance ID	DTXSID70225389
Den Store Danske ID	berkelium
DrugBank ID	12993
Elhuyar ZTH ID	021522
Encyclopædia Britannica Online ID	science/berkelium
Encyclopædia Universalis ID	berkelium
Freebase ID	/m/025svnm
French Vikidia ID	Berkélium
GND ID	4511718-4
Gran Enciclopèdia Catalana ID	0223127
Great Russian Encyclopedia Online ID	1860452
InChI	InChI=1S/Bk
InChIKey	PWVKJRSRVJTHTR-UHFFFAOYSA-N
KBpedia ID	Berkelium
Library of Congress authority ID	sh2012004283
MeSH descriptor ID	D001603
NE.se ID	berkelium
National Library of Israel J9U ID	987007597623305171
OmegaWiki Defined Meaning	156441
Probes And Drugs ID	PD058313
PubChem CID	23971
Römpp online ID	RD-02-00987
Store norske leksikon ID	berkelium
Treccani ID	berkelio
UNII	2YQA718KUU
USGS Thesaurus ID	1405
WordNet 3.1 Synset ID	14655312-n

Bekelu (Bk)

Physical Property

Chemical Property

other

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

lisoló

source

Nuclear Screening Constants

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²³⁸Bk

²³⁹Bk

²⁴⁰Bk

²⁴¹Bk

²⁴²Bk

²⁴³Bk

²⁴⁴Bk

²⁴⁵Bk

²⁴⁶Bk

²⁴⁷Bk

²⁴⁸Bk

²⁴⁹Bk

²⁵⁰Bk

²⁵¹Bk

²⁵²Bk

²⁵³Bk

²⁵⁴Bk