Symbol	Db
Atomic number	105
Group	5 (Vanadium group)
Period	7
Block	d
Classification	Transition Metal

Appearance	-
Color	-

Number of protons	105 p+
Number of neutrons	163 n0
Number of electrons	105 e-

From Wikipedia, the free encyclopediaDubnium 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.

Phase at STP	Solid
Density	29.3 g/cm3
Atomic weight	268 u

Melting point	-
Boiling point	-
Heat of vaporization	-

Electronegativity (Pauling Scale)	-
Electron affinity	-
Oxidation states	(+3), (+4), +5 (parenthesized: prediction)
Ionization energies	664.8 kJ/mol 1546.7 kJ/mol 2378.4 kJ/mol 3298.8 kJ/mol 4305.2 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f14 6d3 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d3 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d3 7s2
Electrons per shell	2, 8, 18, 32, 32, 11, 2
Valence electrons	2
Valency electrons	5
Bohr model	Figure: Shell diagram of Dubnium (Db) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s

Discovery

Independently by the Lawrence Berkeley Laboratory and Joint Institute for Nuclear Research (1970)

CAS Number	53850-35-4
ChemSpider ID	-
EC number	-
PubChem CID Number	56951718