Mendelu (Md)

chemical element with the atomic number of 101 and symbol Md

Atomic Number	101
Atomic Weight	258
mass number	244

Group
Period	7
Block	f

Proton	101 p⁺
Netron	143 n⁰
Eléktron	101 e^-

Physical Property

Atomic Radius
molar volume
covalent radius	173 pm 139 pm
Metallic Radius
ionic radius	109,5 pm
Crystal Radius	123,5 pm
Van der Waals radius	246 pm 327,4 pm
density	10,3 g/cm³

Chemical Property

molungé

proton affinity
electron affinity
ionization energy	6,58 eV/particle 10 eV/particle 24,3 eV/particle 40 eV/particle 54,1 eV/particle 76 eV/particle 96 eV/particle 115,1 eV/particle 143,9 eV/particle 162 eV/particle 187 eV/particle 215 eV/particle 240 eV/particle 260 eV/particle 282 eV/particle 307 eV/particle 334 eV/particle 360 eV/particle 386 eV/particle 412 eV/particle 438 eV/particle 462 eV/particle 486 eV/particle 659 eV/particle 690 eV/particle 723 eV/particle 760 eV/particle 794 eV/particle 828 eV/particle 885 eV/particle 920 eV/particle 958 eV/particle 994 eV/particle 1.160 eV/particle 1.200 eV/particle 1.250 eV/particle 1.290 eV/particle 1.430 eV/particle 1.480 eV/particle 1.620 eV/particle 1.660 eV/particle 1.840 eV/particle 1.930 eV/particle 2.020 eV/particle 2.110 eV/particle 2.200 eV/particle 2.290 eV/particle 2.380 eV/particle 2.000 eV/particle 2.580 eV/particle 2.680 eV/particle 2.760 eV/particle 2.860 eV/particle 2.950 eV/particle 3.050 eV/particle 3.513 eV/particle 3.592 eV/particle 3.675 eV/particle 3.762 eV/particle 3.845 eV/particle 3.926 eV/particle 4.109 eV/particle 4.194 eV/particle 4.286 eV/particle 4.371 eV/particle 4.720 eV/particle 4.800 eV/particle 4.890 eV/particle 4.970 eV/particle 5.580 eV/particle 5.680 eV/particle 5.930 eV/particle 6.030 eV/particle 9.430 eV/particle 9.620 eV/particle 9.810 eV/particle 10.020 eV/particle 10.220 eV/particle 10.410 eV/particle 10.930 eV/particle 11.130 eV/particle 11.360 eV/particle 11.560 eV/particle 12.140 eV/particle 12.310 eV/particle 12.500 eV/particle 12.680 eV/particle 14.560 eV/particle 14.800 eV/particle 15.200 eV/particle 15.400 eV/particle 31.000 eV/particle 31.500 eV/particle 32.000 eV/particle 32.500 eV/particle 39.500 eV/particle 40.100 eV/particle 41.000 eV/particle 41.548 eV/particle 164.764 eV/particle

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
Eléktron

electron shell	2, 8, 18, 32, 31, 8, 2

valence electron	2 ⓘ

electron configuration	[Rn] 5f¹³ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹³ 7s²

oxidation number	2, 3
electronegativity	0.23542
Electrophilicity Index
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point
Melting Point	1.100,15 K
critical pressure
critical temperature
triple point
appearance
Lángi	Colorless #ffffff #b30da6 #b30da6
appearance
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	()
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	45
Mendeleev Number	38
Pettifor Number	36
Geochemical Class
Goldschmidt classification	synthetic

other

Gas Basicity
polarizability	109 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
Neutron Mass Absorption
quantum number	2F7/2
space group	()

Isotopes of Mendelevium

Stable Isotopes	0
Unstable Isotopes	19
Natural Isotopes	0

²⁴⁴Md

mass number	244
neutron number	143
Relative Atomic Mass	244,081157 ± 0,000402 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	0,36 ± 0,14 s
spin	3
nuclear quadrupole moment
time of discovery or invention	2020
parity	+

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
β⁺ SF (β⁺-delayed fission)	14%

²⁴⁵Md

mass number	245
neutron number	144
Relative Atomic Mass	245,080864 ± 0,000279 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	0,38 ± 0,1 s
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1996
parity	-

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

²⁴⁶Md

mass number	246
neutron number	145
Relative Atomic Mass	246,081713 ± 0,000279 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	0,92 ± 0,18 s
spin	1
nuclear quadrupole moment
time of discovery or invention	1996
parity	-

decay mode	intensity
α (α emission)	100%

²⁴⁷Md

mass number	247
neutron number	146
Relative Atomic Mass	247,08152 ± 0,000223 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	1,19 ± 0,09 s
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1981
parity	-

decay mode	intensity
α (α emission)	100%
SF (spontaneous fission)	0.1%

²⁴⁸Md

mass number	248
neutron number	147
Relative Atomic Mass	248,082607 ± 0,000198 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	7 ± 3 s
spin
nuclear quadrupole moment
time of discovery or invention	1973
parity

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	80%
α (α emission)	20%
β⁺ SF (β⁺-delayed fission)	0.05%

²⁴⁹Md

mass number	249
neutron number	148
Relative Atomic Mass	249,082857155 ± 0,000176516 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	25,6 ± 0,9 s
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1973
parity	-

decay mode	intensity
α (α emission)	75%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁵⁰Md

mass number	250
neutron number	149
Relative Atomic Mass	250,084164934 ± 0,000097606 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	54 ± 4 s
spin	2
nuclear quadrupole moment
time of discovery or invention	1973
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	93%
α (α emission)	7%
β⁺ SF (β⁺-delayed fission)	0.026%

²⁵¹Md

mass number	251
neutron number	150
Relative Atomic Mass	251,084774287 ± 0,00002031 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	4,21 ± 0,23 m
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1973
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)	10%

²⁵²Md

mass number	252
neutron number	151
Relative Atomic Mass	252,086385 ± 0,000098 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	2,3 ± 0,8 m
spin	1
nuclear quadrupole moment
time of discovery or invention	1973
parity	+

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

²⁵³Md

mass number	253
neutron number	152
Relative Atomic Mass	253,087143 ± 0,000034 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	12 ± 8 m
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1992
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0.7%

²⁵⁴Md

mass number	254
neutron number	153
Relative Atomic Mass	254,08959 ± 0,000107 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	10 ± 3 m
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1970
parity	-

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

²⁵⁵Md

mass number	255
neutron number	154
Relative Atomic Mass	255,091081702 ± 0,000005976 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	27 ± 2 m
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1958
parity	-

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

²⁵⁶Md

mass number	256
neutron number	155
Relative Atomic Mass	256,093888 ± 0,000133 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	77,7 ± 1,8 m
spin	1
nuclear quadrupole moment
time of discovery or invention	1955
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	90.8%
α (α emission)	9.2%
SF (spontaneous fission)	3%

²⁵⁷Md

mass number	257
neutron number	156
Relative Atomic Mass	257,095537343 ± 0,000001683 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	5,52 ± 0,05 h
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1965
parity	-

decay mode	intensity
ϵ (electron capture)	85%
α (α emission)	15%
SF (spontaneous fission)

²⁵⁸Md

mass number	258
neutron number	157
Relative Atomic Mass	258,098433634 ± 0,000003729 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	51,59 ± 0,29 d
spin	8
nuclear quadrupole moment
time of discovery or invention	1970
parity	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	0.0015%
β⁻ (β⁻ decay)	0.0015%

²⁵⁹Md

mass number	259
neutron number	158
Relative Atomic Mass	259,100445 ± 0,000108 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	1,6 ± 0,06 h
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1982
parity	-

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

²⁶⁰Md

mass number	260
neutron number	159
Relative Atomic Mass	260,10365 ± 0,000339 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	27,8 ± 0,8 d
spin
nuclear quadrupole moment
time of discovery or invention	1989
parity

decay mode	intensity
SF (spontaneous fission)	100%
α (α emission)	5%
ϵ (electron capture)	5%
β⁻ (β⁻ decay)	3.5%

²⁶¹Md

mass number	261
neutron number	160
Relative Atomic Mass	261,105828 ± 0,000546 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	7/2
nuclear quadrupole moment
time of discovery or invention
parity	-

decay mode	intensity
α (α emission)

²⁶²Md

mass number	262
neutron number	161
Relative Atomic Mass	262,109144 ± 0,000481 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin
nuclear quadrupole moment
time of discovery or invention
parity

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

lisoló

discoverer or inventor	G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.
location of discovery	United States
time of discovery or invention	1955
etymology	Named in honor of the scientist Dmitri Ivanovitch Mendeleyev, who devised the periodic table.
pronunciation	men-deh-LEE-vi-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

Mendelu on ChemicalAid

mendelevium

Australian Educational Vocabulary ID	scot/3543
CAS Registry Number	7440-11-1
ChEBI ID	33395
ChemSpider ID	22385
DSSTOX compound identifier	DTXCID90147877
DSSTox substance ID	DTXSID90225386
Den Store Danske ID	mendelevium
Elhuyar ZTH ID	028036
Encyclopedia of China (Third Edition) ID	185251
Encyclopedia of China ID (Second Edition)	220827
Encyclopædia Britannica Online ID	science/mendelevium
Encyclopædia Universalis ID	mendelevium
Freebase ID	/m/025s0rf
French Vikidia ID	Mendélévium
GND ID	4169413-2
Gran Enciclopèdia Catalana ID	0122687
Great Russian Encyclopedia Online ID	2204025
InChI	InChI=1S/Md
InChIKey	MQVSLOYRCXQRPM-UHFFFAOYSA-N
Interlingual Index ID	i113965
KBpedia ID	Mendelevium
MeSH descriptor ID	D008573
OmegaWiki Defined Meaning	335094
PubChem CID	23943
Quora topic ID	Mendelevium
Römpp online ID	RD-13-01207
Store norske leksikon ID	mendelevium
Treccani ID	mendelevio
UNII	LW3E571O0Z
USGS Thesaurus ID	1502

Mendelu (Md)

Physical Property

Chemical Property

other

Isotopes of Mendelevium

244Md

245Md

246Md

247Md

248Md

249Md

250Md

251Md

252Md

253Md

254Md

255Md

256Md

257Md

258Md

259Md

260Md

261Md

262Md

lisoló

source

Nuclear Screening Constants

²⁴⁴Md

²⁴⁵Md

²⁴⁶Md

²⁴⁷Md

²⁴⁸Md

²⁴⁹Md

²⁵⁰Md

²⁵¹Md

²⁵²Md

²⁵³Md

²⁵⁴Md

²⁵⁵Md

²⁵⁶Md

²⁵⁷Md

²⁵⁸Md

²⁵⁹Md

²⁶⁰Md

²⁶¹Md

²⁶²Md