109Mt[278]
Meitnerium
Unknown propertiesSuper-heavy elements made in labs a few atoms at a time. Their chemistry is still being studied.
[Rn] 5f¹⁴ 6d⁷ 7s²
- Atomic number
- 109
- Atomic mass
- [278]
- Protons
- 109
- Neutrons
- 169
- Electrons
- 109
- Shells
- 2, 8, 18, 32, 32, 15, 2
- State at 25 °C
- Unknown
- Position
- Group 9, period 7
Proton (+)Neutron (0)Electron (−)
Discovered byGSI Darmstadt, 1982Peter Armbruster: 6 elementsGottfried Münzenberg: 3 elements
Named after Lise Meitner, who helped explain nuclear fission.
Did you know?
- It's one of very few elements named after a woman.
- Only a few atoms have ever been made.
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 Meitnerium. Explore it with the animated atom above instead.