109 Mt 278
Meitnerium
unknown, probably transition metal
Properties
- Atomic number
- 109
- Atomic mass
- 278 u
- Category
- unknown, probably transition metal
- Group
- 9
- Period
- 7
- Block
- d-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- -
- Density
- 37.4 g/cm³
- Melting point
- -
- Boiling point
- -
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁷
Noble-gas shorthand: [Rn] 5f¹⁴ 6d⁷ 7s²
Electrons per shell: 2, 8, 18, 32, 32, 15, 2, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Meitnerium
Meitnerium is a chemical element with symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds.
- Discovered by Gesellschaft für Schwerionenforschung
Meitnerium: frequently asked questions
- What is Meitnerium?
- Meitnerium (Mt) is the chemical element with atomic number 109. It is not yet firmly classified; it is listed as "unknown, probably transition metal".
- What is the atomic number of Meitnerium?
- Meitnerium's atomic number is 109, which means every Meitnerium atom has 109 protons in its nucleus.
- What is the electron configuration of Meitnerium?
- The electron configuration of Meitnerium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d7 (noble-gas shorthand: [Rn] 5f14 6d7 7s2). Its electrons are arranged in shells of 2, 8, 18, 32, 32, 15, 2, with 2 in the outermost shell.
- Is Meitnerium a metal or a nonmetal?
- Meitnerium is not yet firmly classified; it is listed as "unknown, probably transition metal".
- What group and period is Meitnerium in?
- Meitnerium is in group 9 and period 7 of the periodic table.
- Is Meitnerium a solid, liquid, or gas?
- At room temperature, Meitnerium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.