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109Mt278
Meitnerium
Unknown propertiesBlock dPeriod 7Group 9solid at 20 °C
Configuration :[Rn] 5f¹⁴ 6d⁷ 7s²
Atomic mass :278 u
French :Meitnérium
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Predicted propertiesMany physical properties of this element are theoretical calculated values, not experimental measurements. Transactinides (Z ≥ 104) are only synthesized as a few atoms with very short half-lives. Source: IUPAC 2021.
3D Bohr-model representation of the Meitnerium atom (symbol Mt, atomic number Z=109). Electron shell configuration: 2, 8, 18, 32, 32, 15, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Rn] 5f¹⁴ 6d⁷ 7s²
Short[Rn] 5f¹⁴ 6d⁷ 7s²
Valence electrons9
KLMNOPQ shells
K2
L8
M18
N32
O32
P15
Q2
Electronegativity
Pauling—
Allen—
Mulliken (eV)—
Atomic radii
Empirical—
Calculated—
Covalent—
Van der Waals—
Successive ionisation energies
I₁800 kJ/mol
Electron affinity—
Oxidation states
+1+3+4+6+8+9
Bold states = most common.