Yes. Dubnium is a metal, classified as a transition metal on the periodic table.

How many protons does dubnium have?

Dubnium has 105 protons. Its atomic number is 105, which is also the number of electrons in a neutral atom of dubnium.

What group and period is dubnium in?

Dubnium is in group 5 and period 7 of the periodic table, in the d-block.

What is the atomic mass of dubnium?

The atomic mass of dubnium is 268 u (unified atomic mass units).

Element 105

Dubnium (Db)

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

Dubnium (Db) is element 105 of the periodic table, a transition metal in period 7, group 5 (d-block) with an atomic mass of 268 and is a solid at standard conditions.

At a glance

Atomic number: 105
Symbol: Db
Atomic mass: 268 u
Category: Transition metals
Period: 7
Group: 5
Block: d-block
Phase at STP: solid

Electron structure

Electron configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d3 7s2
Shorthand configuration: [Rn] 5f14 6d3 7s2
Electrons per shell: 2, 8, 18, 32, 32, 11, 2
Oxidation states: +5

Physical properties

Dubnium has only ever been produced in quantities too small to weigh or observe in bulk. The physical and atomic values below are theoretical predictions from periodic trends and relativistic calculations, not measurements.

Density: 29.3 g/cm³ (predicted)
Phase: solid

Atomic properties

Covalent radius: 149 pm (predicted)
First ionization energy: 665 kJ/mol (predicted)

Notable isotopes

Notable isotopes of Dubnium: mass number, atomic mass, natural abundance, and stability.
Isotope	Mass	Abundance	Stability
Db-268	268.12567	-	Half-life 16 hours

Common uses

Scientific research only

Discovery

Year: 1967
Discovered by: Joint Institute for Nuclear Research
Country: Russia

Frequently asked questions

Is dubnium a metal?: Yes. Dubnium is a metal, classified as a transition metal on the periodic table.
How many protons does dubnium have?: Dubnium has 105 protons. Its atomic number is 105, which is also the number of electrons in a neutral atom of dubnium.
What group and period is dubnium in?: Dubnium is in group 5 and period 7 of the periodic table, in the d-block.
What is the atomic mass of dubnium?: The atomic mass of dubnium is 268 u (unified atomic mass units).

Keep exploring

Dubnium's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.