Md
Mendelevium
Element 101 · 258.09843 u
Mendelevium was the first element produced one atom at a time.
Physical Properties
| Atomic Mass | 258.09843 u |
| Density | 10.3 g/cm³ |
| Melting Point | 1100.0 K |
| Appearance | Metallic (predicted) |
| State at Room Temp | Solid |
Chemical Properties
| Electronegativity | 1.3 (Pauling) |
| 1st Ionization Energy | 635.0 kJ/mol |
| Electron Affinity | -93.91 kJ/mol |
| Oxidation States | +2, +3 |
Atomic Properties
| Electron Configuration | [Rn] 5f13 7s2 |
Discovery
| Discovered By | Albert Ghiorso, Bernard G. Harvey, Gregory R. Choppin, Stanley G. Thompson, Glenn T. Seaborg |
| Discovery Year | 1955 |
| Location | Berkeley, California, USA |
| Named After | Named after Dmitri Mendeleev, creator of the periodic table |
About Mendelevium
Mendelevium was created by bombarding einsteinium with alpha particles. The initial experiment produced only 17 atoms.
Uses & Applications
No practical applications. Scientific research only.
Fun Fact
Mendelevium was the first element identified one atom at a time -- only 17 atoms were initially produced.
Isotopes
| Mass Number | Abundance | Half-Life | Stable |
| 258 | - | 51.5 days | No |
| 260 | - | 27.8 days | No |
Electron Configuration
[Rn] 5f13 7s2