Md
Mendelevium
MENDELEVIUM
TRANSITION ELEMENT: ACTINIDE
| Atomic number: | 101 |
| Group numbers: | 3 |
| Period: | 7 |
| Electronic configuration: | [Rn] 5f13 7s2 |
| Formal oxidation number: | +2 +3 |
| Electronegativities: | - |
| Atomic radius / pm: | - |
| Relative atomic mass: | - |
Mendelevium was discovered by Albert Ghiorso, Bernard G. Harvey, Gregory R. Choppin, Stanley G. Thompson, and Glenn T. Seaborg (US) in 1955. Named in honour of Dimitri Mendelejev, the Russian chemist who devised the periodic table. It is a synthetic radioactive metal. With extremely limited amounts of Mendelevium ever being synthesized it does not have any uses outside of scientific research capacities. Mendelevium was made by bombarding einsteinium with helium ions.
| Density / g dm-3: | - | |
| Molar volume / cm3mol-1: | - | |
| Electrical resistivity / µΩcm: | - | (20 °C) |
| Thermal conductivity / W m-1K-1: | - |
| Melting point / °C: | 827 |
| Boiling point / °C: | - |
| Heat of fusion / kJ mol-1: | - |
| Heat of vaporization / kJ mol-1: | - |
| Heat of atomization / kJ mol-1: | 116 |
| First ionization energy / kJ mol-1: | 634.88 |
| Second ionization energy / kJ mol-1: | - |
| Third ionization energy / kJ mol-1: | - |
| in the atmosphere / ppm: | - |
| in the Earth's crust / ppm: | - |
| in the oceans / ppm: | - |
| Crystal structure: | unknown structure |
| Unit-cell dimensions / pm: | - |
| Space group: | - |
| Isotope | Relative atomic mass | Mass percent (%) |
|---|---|---|
| 258Md | 258.098 43(3) | * |
| 260Md | 260.104(2) | * |
| Balanced half-reaction | Eo / V | |
|---|---|---|
| 100 Fermium | ← | 101 Mendelevium | → | 102 Nobelium |
Citing this page:
Generalic, Eni. "Mendelevium." EniG. Periodic Table of the Elements. KTF-Split, 18 Jan. 2024. Web. {Date of access}. <https://www.periodni.com/md.html>.
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