Mendelevium
| Atomic Number: | 101 |
| Symbol: | Md |
| Atomic weight: | (258) |
| Discovery: | Ghiorso, Harvey, Choppin, Thompson, and Seaborg (1955) |
| Electron Configuration: | [Rn]7s25f13 |
| Word Origin: | Named in honor of Dmitri Mendeleev |
| Isotopes: | Fourteen isotopes have been recognized. |
| Properties: | Mendelevium is the ninth transuranium element of the actinide series. Experiments indicate that mendelevium has a moderately stable dipositive (II) oxidation state in addition to the tripositive (III) oxidation state, as is characteristic of the actinide elements. |
| Uses: | Md-256 has been used to determine some of the chemical properties of mendelevium in aqueous solution. |
| Sources: | Mendelevium first was produced during the bombardment of Es-253 with helium ions in the Berkeley 60-inch cyclotron. The isotope produced was Md-256, with a half-life of 76 min. Md-256 was synthesized on a one-atom-at-a-time basis. |
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