109
Mt
278
Meitnerium (Mt)
Element 109 · Period 7 · Group 9
unknown
solid at room temp
d-block
radioactive
synthetic
About Meitnerium
Named after Lise Meitner, who co-discovered nuclear fission.
Physical Properties
Atomic Mass
278 u
State at 25°C
Solid
Density
37.4 g/cm³
Magnetism
Unknown
Atomic Properties
Electron Configuration
[Rn] 5f¹⁴ 6d⁷ 7s²
Electron Shells
2, 8, 18, 32, 32, 15, 2
Oxidation States
+3, +6
Discovery & History
Discovered By
Peter Armbruster
Discovery Year
1982
Named By
IUPAC
Name origin: Lise Meitner
Frequently Asked Questions
- Is Meitnerium a metal, nonmetal, or metalloid?
- Meitnerium is classified as a unknown.
- What state is Meitnerium in at room temperature?
- Meitnerium is a solid at standard room temperature (25°C).
- What is the atomic mass of Meitnerium?
- Meitnerium has an atomic mass of 278 atomic mass units (u).
- Who discovered Meitnerium?
- Meitnerium was discovered by Peter Armbruster in 1982.
- Where is Meitnerium on the periodic table?
- Meitnerium is element number 109, located in period 7 and group 9.