Chemical element · Atomic number 109
Meitnerium
Meitnerium in the periodic table: atomic number 109, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Transition metal
solid
[277.154] u
Generated illustrationGenerated illustration, Quanta Study. Not a photograph of a sample.
Generated illustration of Meitnerium; the image does not show a sample of the element.
Synthetic element produced a few atoms at a time; there is no visible sample.
Code-native illustration with the Quanta Study mark inside the image; not a photograph, no AI model involved.
Atomic classification
Shell occupancy
Meitnerium in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 32 electrons
- O · n=5
- 32 electrons
- P · n=6
- 15 electrons
- Q · n=7
- 2 electrons
- Electron configuration
- [Rn]7s2 5f14 6d7 (calculated)
- Electrons per shell
- 2 · 8 · 18 · 32 · 32 · 15 · 2
- Group
- 9
- Period
- 7
- Block
- D
- Element category
- Transition metal
Physical and chemical properties
- Atomic mass
- [277.154] u
- Standard state
- solid
- Density
- not reported
- Melting point
- not reported
- Boiling point
- not reported
- Electronegativity
- not reported
- First ionisation energy
- not reported
- Oxidation states
- +9, +8, +6, +4, +3, +1
- Discovery
- 1982
Safety and periodic classification
Safety
Safe handling cannot be inferred from Meitnerium's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Meitnerium is in period 7, group 9 and the D block. Its direct neighbours by atomic number are Hassium and Darmstadtium. The snapshot does not report a Pauling electronegativity. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.
Where Meitnerium sits among the 118 elements
The table compares the reported values for Meitnerium with every other element that carries the same value in the snapshot. A rank is not a judgement, it is orientation: it says how unusual this value is across the periodic table.
The snapshot reports no measured material data for Meitnerium. That is normal for the heaviest elements, which exist only in minute quantities, and it is stated here instead of showing estimates.
All values and ranks come from the PubChem Periodic Table snapshot, retrieved on 2026-07-15. Elements without a reported value are excluded, so the population differs per row.
The neighbours of Meitnerium in the periodic table
- Place in the table
- Group 9, period 7, D block. Classified as transition metal, solid at standard conditions.
- Direct neighbours
- Atomic number 109. Preceded by Hassium, followed by Darmstadtium.
- Same group
- Same number of outer electrons, and therefore similar reactivity to Cobalt, Rhodium, Iridium.
- Discovery
- Recorded in the snapshot as: 1982. Who, where and under what circumstances is not part of that record, so this page carries the sourced year and no discovery narrative.
- Oxidation states
- +9, +8, +6, +4, +3, +1. They follow from the electron configuration [Rn]7s2 5f14 6d7 (calculated) and indicate which compounds to expect.
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