Meitnerium
Meitnerium (鿏, symbol Mt) is chemical element number 109, an Unknown in period 7, group 9 of the periodic table, with a standard atomic weight of about 278. Named after Lise Meitner. Only a handful of atoms have ever been produced.
Properties
| Atomic number | 109 |
|---|---|
| Symbol | Mt |
| Atomic mass | 278 u |
| Category | Unknown |
| Period | 7 |
| Group | 9 |
| Electron configuration | [Rn] 5f¹⁴ 6d⁷ 7s² |
| Electronegativity | — |
| Covalent radius | — |
| Density | 37.4 g/cm³ |
| Melting point | — |
| Boiling point | — |
| Discovery | GSI, 1982 |
Overview
Named after Lise Meitner. Only a handful of atoms have ever been produced. Element 109, Meitnerium (Mt), is an Unknown found in period 7, group 9. Most of its properties still await further experimental confirmation.
With 2 electrons in its outermost shell, Meitnerium bonds accordingly; full configuration [Rn] 5f¹⁴ 6d⁷ 7s². Its physical state follows from its melting and boiling points; it has a density around 37.4 g/cm³.
Common applications range across Research. On the safety side, it carries a high hazard rating. It was first described by GSI in 1982. The periodic trends guide explains the underlying patterns.
Electron shells
Electrons per shell: 2 · 8 · 18 · 32 · 32 · 15 · 2
Main uses
- Research
Hazard
Compounds containing Meitnerium
No compounds in this knowledge base contain Meitnerium yet.
Data sources
Atomic mass uses IUPAC (CIAAW) standard atomic weights; the covalent radius is from Cordero et al. (2008). Verify on the RSC Periodic Table, PubChem and Wikipedia. Educational reference only.