Element Mendelevium
Mendelevium was discovered by bombarding einsteinium with alpha particles in 1955, the same method still used to produce it today.
It was named after Dmitri Mendeleev, father of the periodic table of the chemical elements.
Mendelevium is a synthetic element with the symbol Md (formerly Mv) and atomic number 101.
In the periodic table, mendelevium is located to the right of the actinide fermium, to the left of the actinide nobelium, and below the lanthanide thulium.
Mendelevium metal has not yet been prepared in bulk quantities, and bulk preparation is currently impossible. Nevertheless, a number of predictions and some preliminary experimental results have been done regarding its properties.
Names and Identifiers
| Chemical Formula: | Md |
| CAS: | 7440-11-1 |
| Molecular Weight: | 258.00000g/mol |
| EC Number : | n/a |
| MDL Number: | n/a |
| Color: | unknown (presumably metallic/ silvery white/ gray) |
| Other Names: | Mendelevio |
| PubChem CID: | 23943 |
| IUPAC Name: | Mendelevium |
| Inchl: | InChI=1S/Md |
| InChI Key: | MQVSLOYRCXQRPM-UHFFFAOYSA-N |
| Canonical SMILES: | [Md] |
| ICSC Number: | n/a |
Physical & Chemical Properties
| Phase: | Solid |
| Density: | 10.3 g/cm³ |
| Boiling Point: | 1100 K (827 °C, 1521 °F) |
| Melting Point: | n/a |
| Molecular Formula: | Md |
| Flash Point: | n/a |
| Exact Mass: | 258.09800 |
Sixteen isotopes of mendelevium are known, with mass numbers from 245 to 260; all are radioactive
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 255Md | 255.09108 | 27 m | α to 251Es; EC to 255Fm; SF | 7/2 | |
| 256Md | 256.0941 | 1.3 h | α to 252Es; EC to 256Fm; SF | ||
| 257Md | 257.09553 | 57 m | α to 253Es; EC to 257Fm; SF | 7/2 | |
| 258Md | 258.09857 (22) | 51.5 d | EC to 258Fm | 8 | |
| 259Md | 259.1005 | 1.6 h | α to 255Es; SF | 7/2 | |
| 260Md | 260.104 | 32 d | EC to 260Fm; α to 256Es; β– to 260No |