101Md[258]
Mendelevium
ActinidesHeavy, radioactive metals. Most of them are made only in laboratories.
[Rn] 5f¹³ 7s²
- Atomic number
- 101
- Atomic mass
- [258]
- Protons
- 101
- Neutrons
- 157
- Electrons
- 101
- Shells
- 2, 8, 18, 32, 31, 8, 2
- State at 25 °C
- Solid
- Position
- Period 7, f-block
Proton (+)Neutron (0)Electron (−)
Discovered byAlbert Ghiorso, Bernard Harvey, Gregory Choppin, Stanley Thompson and Glenn Seaborg, 1955Albert Ghiorso: 12 elementsGlenn T. Seaborg: 10 elementsStanley G. Thompson: 5 elements
Named after Dmitri Mendeleev, the father of the periodic table.
Did you know?
- The first experiment made only 17 atoms.
- It was the first element made one atom at a time.
Where it's found
- Made only in laboratories, a few atoms at a time
What it's used for
- Scientific research only
Try it
There's no safe home experiment for Mendelevium. Explore it with the animated atom above instead.