102No[259]
Nobelium
ActinidesHeavy, radioactive metals. Most of them are made only in laboratories.
[Rn] 5f¹⁴ 7s²
- Atomic number
- 102
- Atomic mass
- [259]
- Protons
- 102
- Neutrons
- 157
- Electrons
- 102
- Shells
- 2, 8, 18, 32, 32, 8, 2
- State at 25 °C
- Solid
- Position
- Period 7, f-block
Proton (+)Neutron (0)Electron (−)
Discovered byJoint Institute for Nuclear Research, Dubna, 1960sAlbert Ghiorso: 12 elementsGlenn T. Seaborg: 10 elements
Early claims from Sweden in 1957 were disputed. The name honours Alfred Nobel, founder of the Nobel Prizes.
Did you know?
- The name stayed even though credit went to another team.
- Its longest-lived form lasts under an hour.
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 Nobelium. Explore it with the animated atom above instead.