105 predicted 2 · 8 · 18 · 32 · 32 · 11 · 2

Dubnium, Db, element 105

Transition metal· Period 7· Group 5· d-block

Configuration [Rn]5f146d37s2

Atomic weight
268Da
Phase
solid, predicted
Density
21.6g/cm³, predicted
Melting point
No data
Boiling point
No data
Electronegativity
No data

Also known as Hahnium, Ha. Radioactive transactinide element. Half-life of 1.6s. Discovered in 1970 by Berkeley researchers. So far, seven isotopes have been discovered. 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 dubnium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
268Da
Source: mendeleev
Electron configuration
[Rn]5f146d37s2
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d104f145s25p65d105f146s26p66d37s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 32 · 32 · 11 · 2
Source: Worked outfrom electron configuration

No data uncertainty of the atomic weight.