Mendelevium (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+ |
|---|---|
| neutron | 143 n0 |
| electron | 101 e- |
Physical Property
| Atomic Radius | |
|---|---|
| molar volume | |
| covalent radius | |
| Metallic Radius | |
| ionic radius | |
| Crystal Radius | |
| Van der Waals radius | |
| density |
Chemical Property
| bree | |
|---|---|
| proton affinity | |
| electron affinity | |
| ionization energy | |
| enthalpy of vaporization | |
| enthalpy of fusion | |
| standard enthalpy of formation | |
| electron | |
| 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 | |
| Electrophilicity Index | |
| fundamental state of matter | |
| phase of matter | {ERROR}|
| gaseous state of matter | |
| Boiling Point | |
| Melting Point | |
| critical pressure | |
| critical temperature | |
| triple point | |
| appearance | |
| color | Black
|
| 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 | {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 | 45 |
| Mendeleev Number | 38 |
| Pettifor Number | 36 |
| Geochemical Class | |
| Goldschmidt classification | synthetic |
other
| Gas Basicity | |
|---|---|
| polarizability | |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | 0
|
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| 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 |
| Trimmid Breneenagh | |
| g-factor | |
| natural abundance | |
| goul-roorid | ☢️ bunstoo goul-rooragh |
| half-life | |
| spin | |
| nuclear quadrupole moment | |
| time of discovery or invention | |
| parity |
| decay mode | intensity |
|---|---|
| SF (spontaneous fission) | |
| α (α emission) |
shennaghys
| 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 |
| Bun-ocklaght | Named in honor of the scientist Dmitri Ivanovitch Mendeleyev, who devised the periodic table. |
| pronunciation | men-deh-LEE-vi-em (en) |
source
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (ocean) | |
| natural abundance (human body) | 0 %
|
| natural abundance (meteoroid) | 0 %
|
| natural abundance (Yn Ghrian) | 0 %
|
| Abundance in Universe | 0 %
|
