Einsteinium (Es)

chemical element with the atomic number of 99

Atomic Number	99
Atomic Weight	252
mass number	239

Group
Period	7
Block	f

proton	99 p⁺
neutron	140 n⁰
electron	99 e^-

Physical Property

Atomic Radius
molar volume
Covalent Radius	165 pm 140 pm
Metallic Radius
ionic radius	111,6 pm
Crystal Radius	125,6 pm
Van der Waals radius	245 pm 329,9 pm
density	8,84 g/cm³

Chemical Property

{ERROR}

energy

proton affinity
electron affinity
ionization energy	6,3676 eV/particle 12,2 eV/particle 22,7 eV/particle 38,8 eV/particle 54,1 eV/particle 71 eV/particle 97 eV/particle 112,9 eV/particle 137 eV/particle 157 eV/particle 180 eV/particle 206 eV/particle 231 eV/particle 252 eV/particle 270 eV/particle 294 eV/particle 317 eV/particle 342 eV/particle 367 eV/particle 398 eV/particle 421 eV/particle 576 eV/particle 606 eV/particle 638 eV/particle 672 eV/particle 705 eV/particle 738 eV/particle 790 eV/particle 824 eV/particle 861 eV/particle 895 eV/particle 1 060 eV/particle 1 100 eV/particle 1 140 eV/particle 1 180 eV/particle 1 310 eV/particle 1 360 eV/particle 1 480 eV/particle 1 530 eV/particle 1 690 eV/particle 1 780 eV/particle 1 870 eV/particle 1 950 eV/particle 2 040 eV/particle 2 130 eV/particle 2 220 eV/particle 2 300 eV/particle 2 410 eV/particle 2 490 eV/particle 2 580 eV/particle 2 680 eV/particle 2 760 eV/particle 2 900 eV/particle 3 294 eV/particle 3 370 eV/particle 3 449 eV/particle 3 535 eV/particle 3 616 eV/particle 3 694 eV/particle 3 866 eV/particle 3 947 eV/particle 4 038 eV/particle 4 120 eV/particle 4 456 eV/particle 4 537 eV/particle 4 620 eV/particle 4 700 eV/particle 5 260 eV/particle 5 350 eV/particle 5 600 eV/particle 5 690 eV/particle 8 960 eV/particle 9 140 eV/particle 9 330 eV/particle 9 530 eV/particle 9 720 eV/particle 9 910 eV/particle 10 400 eV/particle 10 590 eV/particle 10 810 eV/particle 11 010 eV/particle 11 570 eV/particle 11 740 eV/particle 11 930 eV/particle 12 110 eV/particle 13 810 eV/particle 14 030 eV/particle 14 460 eV/particle 14 700 eV/particle 29 700 eV/particle 30 100 eV/particle 30 700 eV/particle 31 100 eV/particle 37 400 eV/particle 38 100 eV/particle 38 900 eV/particle 39 451,4 eV/particle 154 328 eV/particle 156 926 eV/particle

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation	133 kJ/mol
electron

electron shell	2, 8, 18, 32, 29, 8, 2

valence electron	2 ⓘ

electron configuration	[Rn] 5f¹¹ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹¹ 7s²

oxidation number	2, 3, 4
electronegativity	0.21427
Electrophilicity Index
fundamental state of matter

phase of matter
gaseous state of matter
Boiling Point
Melting Point	1 133,15 K
critical pressure
critical temperature
triple point
appearance
color	Black #ffffff #b31fd4 #b31fd4
appearance	silver-colored
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	{ERROR}
lattice constant
Lattice Angles
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	43
Mendeleev Number	34
Pettifor Number	38
Geochemical Class
Goldschmidt classification	synthetic

other

Gas Basicity
polarizability	118 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	160
Neutron Mass Absorption
quantum number	5I15/2
space group	()

Isotopes of Einsteinium

Stable Isotopes	0
Unstable Isotopes	20
Natural Isotopes	0

²³⁹Es

mass number	239
neutron number	140
Relative Atomic Mass	239,06831 ± 0,000322 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
α (α emission)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
SF (spontaneous fission)

²⁴⁰Es

mass number	240
neutron number	141
Relative Atomic Mass	240,068949 ± 0,000393 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	6 ± 1,7 s
spin	4
nuclear quadrupole moment
time of discovery or invention	2017
parity	-

decay mode	intensity
α (α emission)	70%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	30%
β⁺ SF (β⁺-delayed fission)	0.16%

²⁴¹Es

mass number	241
neutron number	142
Relative Atomic Mass	241,068592 ± 0,000248 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	5,1 ± 0,8 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1996
parity	-

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

²⁴²Es

mass number	242
neutron number	143
Relative Atomic Mass	242,069567 ± 0,000276 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	17,8 ± 1,6 s
spin	2
nuclear quadrupole moment
time of discovery or invention	1994
parity	+

decay mode	intensity
α (α emission)	57%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	43%
β⁺ SF (β⁺-delayed fission)	0.6%

²⁴³Es

mass number	243
neutron number	144
Relative Atomic Mass	243,069508 ± 0,000222 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	22,1 ± 1,4 s
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1973
parity	+

decay mode	intensity
α (α emission)	61%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
SF (spontaneous fission)	1%

²⁴⁴Es

mass number	244
neutron number	145
Relative Atomic Mass	244,070881 ± 0,000195 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	37 ± 4 s
spin	6
nuclear quadrupole moment
time of discovery or invention	1973
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	95%
α (α emission)	5%
β⁺ SF (β⁺-delayed fission)	0.011%

²⁴⁵Es

mass number	245
neutron number	146
Relative Atomic Mass	245,071192 ± 0,000178 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	1,11 ± 0,06 m
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1967
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	51%
α (α emission)	49%

²⁴⁶Es

mass number	246
neutron number	147
Relative Atomic Mass	246,072806474 ± 0,000096538 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	7,5 ± 0,5 m
spin	4
nuclear quadrupole moment
time of discovery or invention	1954
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	90.1%
α (α emission)	9.9%
β⁺ SF (β⁺-delayed fission)	0.003%

²⁴⁷Es

mass number	247
neutron number	148
Relative Atomic Mass	247,073621929 ± 0,00002087 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	4,55 ± 0,26 m
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1967
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	93%
α (α emission)	7%
SF (spontaneous fission)

²⁴⁸Es

mass number	248
neutron number	149
Relative Atomic Mass	248,075469 ± 0,000056 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	24 ± 3 m
spin	2
nuclear quadrupole moment
time of discovery or invention	1956
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0.25%
β⁺ SF (β⁺-delayed fission)	3.5%

²⁴⁹Es

mass number	249
neutron number	150
Relative Atomic Mass	249,076409 ± 0,000032 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	102,2 ± 0,6 m
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1956
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0.57%

²⁵⁰Es

mass number	250
neutron number	151
Relative Atomic Mass	250,078611 ± 0,000107 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	8,6 ± 0,1 h
spin	6
nuclear quadrupole moment
time of discovery or invention	1956
parity

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

²⁵¹Es

mass number	251
neutron number	152
Relative Atomic Mass	251,079991431 ± 0,000005676 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	33 ± 1 h
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1956
parity	-

decay mode	intensity
ϵ (electron capture)	99.5%
α (α emission)	0.5%

²⁵²Es

mass number	252
neutron number	153
Relative Atomic Mass	252,082979173 ± 0,000053736 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	471,7 ± 1,9 d
spin	4
nuclear quadrupole moment
time of discovery or invention	1956
parity	+

decay mode	intensity
α (α emission)	78%
ϵ (electron capture)	22%

²⁵³Es

mass number	253
neutron number	154
Relative Atomic Mass	253,084821241 ± 0,000001341 Da
g-factor	1,1714285714286 ± 0,02
natural abundance
radioactivity	☢️ radioactive element
half-life	20,47 ± 0,03 d
spin	7/2
nuclear quadrupole moment	6,7 ± 0,8
time of discovery or invention	1954
parity	+

decay mode	intensity
α (α emission)	100%
SF (spontaneous fission)	8.7%

²⁵⁴Es

mass number	254
neutron number	155
Relative Atomic Mass	254,088024337 ± 0,000003152 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	275,7 ± 0,5 d
spin	7
nuclear quadrupole moment
time of discovery or invention	1954
parity	+

decay mode	intensity
α (α emission)	100%
ϵ (electron capture)
β⁻ (β⁻ decay)	1.74%
SF (spontaneous fission)	3%

²⁵⁵Es

mass number	255
neutron number	156
Relative Atomic Mass	255,090273504 ± 0,000011612 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	39,8 ± 1,2 d
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1954
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	92%
α (α emission)	8%
SF (spontaneous fission)	0.0041%

²⁵⁶Es

mass number	256
neutron number	157
Relative Atomic Mass	256,093597 ± 0,000107 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	7,6 h
spin	7
nuclear quadrupole moment
time of discovery or invention	1976
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ SF (β⁻-delayed fission)	0.002%

²⁵⁷Es

mass number	257
neutron number	158
Relative Atomic Mass	257,095979 ± 0,000441 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	7,7 ± 0,2 d
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1987
parity	+

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

²⁵⁸Es

mass number	258
neutron number	159
Relative Atomic Mass	258,09952 ± 0,00043 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)
α (α emission)

history

discoverer or inventor	Argonne, Los Alamos, U of Calif
location of discovery	United States
time of discovery or invention	1952
etymology	Named in honor of the scientist Albert Einstein.
pronunciation	ine-STINE-i-em (engelsk)

source

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

Nuclear Screening Constants

Einsteinium on ChemicalAid

Einsteinium (Es)

Physical Property

Chemical Property

other

Isotopes of Einsteinium

239Es

240Es

241Es

242Es

243Es

244Es

245Es

246Es

247Es

248Es

249Es

250Es

251Es

252Es

253Es

254Es

255Es

256Es

257Es

258Es

history

source

Nuclear Screening Constants

²³⁹Es

²⁴⁰Es

²⁴¹Es

²⁴²Es

²⁴³Es

²⁴⁴Es

²⁴⁵Es

²⁴⁶Es

²⁴⁷Es

²⁴⁸Es

²⁴⁹Es

²⁵⁰Es

²⁵¹Es

²⁵²Es

²⁵³Es

²⁵⁴Es

²⁵⁵Es

²⁵⁶Es

²⁵⁷Es

²⁵⁸Es