Db
Dubnium · element 105
Transition Metal · Solid at room temperature
Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia (north of Moscow), where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.
Key facts
Atomic mass
268 u
how heavy one atom is
Phase (room temp.)
Solid
Density
29.3 g/cm³
how tightly packed it is
Period
7
its row in the periodic table
Group
5
its column in the periodic table
Block
D-block
the neighbourhood it lives in
Electron configuration
*[Rn] 5f14 6d3 7s2
where its electrons live
Shells
2 · 8 · 18 · 32 · 32 · 11 · 2
electrons in each layer, inside to out
Discovered by
Joint Institute for Nuclear Research
who found it
Source: Wikipedia