Elements / 101
101Md[258]
Mendelevium
Actinide · f-block · ring Q
Mendelevium is element 101, an actinide. It is one of the actinides, which the spiral keeps in line on ring Q instead of exiling them to a strip below the table.
Properties
| Density | Not measured | Terrain → |
|---|---|---|
| Melting point | Not measured | Terrain → |
| Boiling point | Not measured | Terrain → |
| Electronegativity | 1.30 | Terrain → |
| First ionization energy | 635 kJ/mol | Terrain → |
| Atomic weight | 258 u | Terrain → |
| Crustal abundance | Not measured | Terrain → |
| Discovered | 1955 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- Its discovery rested on seventeen detected atoms, and its namer had to ask the US government's permission to honor a Russian.
- Discovered at UC Berkeley in early 1955 and named after the father of the periodic table.
Checked against en.wikipedia.org.
Actinides
- Ac Actinium
- Th Thorium
- Pa Protactinium
- U Uranium
- Np Neptunium
- Pu Plutonium
- Am Americium
- Cm Curium
- Bk Berkelium
- Cf Californium
- Es Einsteinium
- Fm Fermium
- Md Mendelevium
- No Nobelium
Ring Q (period 7)
Play with Mendelevium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.