Mendelevi

Mendelevi (Md)

chemical element with the atomic number of 101 and symbol Md
Atomic Number101
Atomic Weight258
Rhif màs244
Group
Period7
Blockf
Proton101 p+
Niwtron143 n0
Electron101 e-
Animated Bohr model of Md (Mendelevi)

Nodwedd Ffisegol

Atomic Radius
molar volume
covalent radius
173 pm
Metallic Radius
ionic radius
109.5 pm
Crystal Radius
123.5 pm
Van der Waals radius
246 pm
density
10.3 g/cm³

Nodwedd Gemegol

egni
proton affinity
electron affinity
ionization energy
ionization energy of Md (Mendelevi)
enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
Electron
plisgyn yr electron2, 8, 18, 32, 31, 8, 2
Bohr model: Md (Mendelevi)
valence electron2
Lewis structure: Md (Mendelevi)
trefn yr electronnau[Rn] 5f13 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f13 7s2
Enhanced Bohr model of Md (Mendelevi)
Orbital Diagram of Md (Mendelevi)
Cyflwr ocsidiad2, 3
Electronegatifedd
Electrophilicity Index
cyflwr sylfaenol mater
cyflwr materSolid
gaseous state of matter
Boiling Point
Melting Point
1,100.15 K
critical pressure
critical temperature
triple point
appearance
lliw
Colorless
appearance
Mynegrif plygiant
nodwedd ffisegol gwrthrych
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
dargludedd trydanol
Gwrthedd
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
strwythur
Crystal Structure ()
lattice constant
Lattice Angles
nodwedd mecanyddol deunyddiau
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number45
Mendeleev Number38
Pettifor Number36
Geochemical Class
Goldschmidt classificationsynthetic

other

Gas Basicity
polarizability
109 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
Neutron Mass Absorption
quantum number2F7/2
space group ()

Isotopes of Mendelevium

Stable Isotopes0
Unstable Isotopes19
Natural Isotopes0

244Md

Rhif màs244
neutron number143
relative atomic mass
244.081157 ± 0.000402 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
0.36 ± 0.14 s
spin3
nuclear quadrupole moment
dyddiad darganfod2020
parity+

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

245Md

Rhif màs245
neutron number144
relative atomic mass
245.080864 ± 0.000279 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
0.38 ± 0.1 s
spin7/2
nuclear quadrupole moment
dyddiad darganfod1996
parity-

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

246Md

Rhif màs246
neutron number145
relative atomic mass
246.081713 ± 0.000279 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
0.92 ± 0.18 s
spin1
nuclear quadrupole moment
dyddiad darganfod1996
parity-

decay modeintensity
α (α emission)100%

247Md

Rhif màs247
neutron number146
relative atomic mass
247.08152 ± 0.000223 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
1.19 ± 0.09 s
spin7/2
nuclear quadrupole moment
dyddiad darganfod1981
parity-

decay modeintensity
α (α emission)100%
SF (spontaneous fission)0.1%

248Md

Rhif màs248
neutron number147
relative atomic mass
248.082607 ± 0.000198 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
7 ± 3 s
spin
nuclear quadrupole moment
dyddiad darganfod1973
parity

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

249Md

Rhif màs249
neutron number148
relative atomic mass
249.082857155 ± 0.000176516 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
25.6 ± 0.9 s
spin7/2
nuclear quadrupole moment
dyddiad darganfod1973
parity-

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

250Md

Rhif màs250
neutron number149
relative atomic mass
250.084164934 ± 0.000097606 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
54 ± 4 s
spin2
nuclear quadrupole moment
dyddiad darganfod1973
parity-

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

251Md

Rhif màs251
neutron number150
relative atomic mass
251.084774287 ± 0.00002031 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
4.21 ± 0.23 m
spin7/2
nuclear quadrupole moment
dyddiad darganfod1973
parity-

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

252Md

Rhif màs252
neutron number151
relative atomic mass
252.086385 ± 0.000098 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
2.3 ± 0.8 m
spin1
nuclear quadrupole moment
dyddiad darganfod1973
parity+

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

253Md

Rhif màs253
neutron number152
relative atomic mass
253.087143 ± 0.000034 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
12 ± 8 m
spin7/2
nuclear quadrupole moment
dyddiad darganfod1992
parity-

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

254Md

Rhif màs254
neutron number153
relative atomic mass
254.08959 ± 0.000107 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
10 ± 3 m
spin0
nuclear quadrupole moment
0
dyddiad darganfod1970
parity-

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

255Md

Rhif màs255
neutron number154
relative atomic mass
255.091081702 ± 0.000005976 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
27 ± 2 m
spin7/2
nuclear quadrupole moment
dyddiad darganfod1958
parity-

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

256Md

Rhif màs256
neutron number155
relative atomic mass
256.093888 ± 0.000133 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
77.7 ± 1.8 m
spin1
nuclear quadrupole moment
dyddiad darganfod1955
parity-

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

257Md

Rhif màs257
neutron number156
relative atomic mass
257.095537343 ± 0.000001683 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
5.52 ± 0.05 h
spin7/2
nuclear quadrupole moment
dyddiad darganfod1965
parity-

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

258Md

Rhif màs258
neutron number157
relative atomic mass
258.098433634 ± 0.000003729 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
51.59 ± 0.29 d
spin8
nuclear quadrupole moment
dyddiad darganfod1970
parity-

decay modeintensity
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)0.0015%
β (β decay)0.0015%

259Md

Rhif màs259
neutron number158
relative atomic mass
259.100445 ± 0.000108 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
1.6 ± 0.06 h
spin7/2
nuclear quadrupole moment
dyddiad darganfod1982
parity-

decay modeintensity
SF (spontaneous fission)100%
α (α emission)

260Md

Rhif màs260
neutron number159
relative atomic mass
260.10365 ± 0.000339 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
27.8 ± 0.8 d
spin
nuclear quadrupole moment
dyddiad darganfod1989
parity

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

261Md

Rhif màs261
neutron number160
relative atomic mass
261.105828 ± 0.000546 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin7/2
nuclear quadrupole moment
dyddiad darganfod
parity-

decay modeintensity
α (α emission)

262Md

Rhif màs262
neutron number161
relative atomic mass
262.109144 ± 0.000481 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay modeintensity
SF (spontaneous fission)
α (α emission)
Electron shell 101 Mendelevium

hanes

darganfyddwr neu ddyfeisiwrG.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.
man darganfodUnited States
dyddiad darganfod1955
geirdarddiadNamed in honor of the scientist Dmitri Ivanovitch Mendeleyev, who devised the periodic table.
ynganiadmen-deh-LEE-vi-em (Saesneg)

source

Abundance
Abundance in Earth's crust
natural abundance (cefnfor)
natural abundance (corff dynol)
0 %
natural abundance (Awyrfaen)
0 %
natural abundance (Haul)
0 %
Abundance in Universe
0 %

Nuclear Screening Constants