109Mt278
Meitnerium
Unknown properties · element 109 · group 9, period 7
Quick facts
| Symbol | Mt |
|---|---|
| Atomic number | 109 |
| Relative atomic mass | 278 |
| Category | Unknown properties |
| Position | group 9, period 7 |
| State at 20 °C | Unknown (too few atoms have been made) |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity | — |
| Electron configuration | [Rn] 5f14 6d7 7s2 |
About Meitnerium
Meitnerium has the symbol Mt and atomic number 109, which means every meitnerium atom has 109 protons in its nucleus and, in a neutral atom, 109 electrons. At room temperature it is unknown (too few atoms have been made).
Only a few atoms of this element have ever been made, in particle accelerators, so most of its properties are predicted rather than measured.
Explore it
See where meitnerium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.