109 predicted 2 · 8 · 18 · 32 · 32 · 15 · 2

Meitnerium, Mt, element 109

Transition metal· Period 7· Group 9· d-block

Configuration [Rn]5f146d77s2

Atomic weight
276Da
Phase
solid, predicted
Density
27.5g/cm³, predicted
Melting point
No data
Boiling point
No data
Electronegativity
No data

Half-life of approximately 5 ms. The creation of this element demonstrated that fusion techniques could indeed be used to make new, heavy nuclei. Made and identified by physicists of the Heavy Ion Research Laboratory, Darmstadt, West Germany in 1982. Named in honor of Lise Meitner, the Austrian physicist. Description from mendeleev.

Back to the table
The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

4 of 5 fields have a value for meitnerium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
276Da
Source: mendeleev
Electron configuration
[Rn]5f146d77s2
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d104f145s25p65d105f146s26p66d77s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 32 · 32 · 15 · 2
Source: Worked outfrom electron configuration

No data uncertainty of the atomic weight.