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Neighborhood
Hf
72
Ta
73
W
74
Rf
104
Db
105
Sg
106
 
 
 

 

Periodic table

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Dubnium

en  English

Dubnium

fr  French

Dubnium

hr  Croatian

Dubnij

it  Italian

Dubnio

es  Spanish

Dubnio

 

Db
Db
Dubnium

PERIODIC TABLE OF THE ELEMENTS

DUBNIUM

TRANSITION ELEMENT:
VANADIUM GROUP

 

Atomic number:105

Group numbers:5

Period:7

Electronic configuration:[Rn] 5f14 6d3 7s2

Formal oxidation number:

Electronegativities:-

Atomic radius / pm:-

Relative atomic mass:[268]

 

Dubnium was discovered by workers at the Nuclear Institute at Dubna (RU) and by workers at the University of California, Berkeley (US) in 1967. The origin of the name dubnium is the Joint Nuclear Institute at Dubna, Russia, an institute heavily involved in the search for heavy elements. It is a synthetic radioactive metal. Dubnium was made by bombarding californium-249 with a beam of nitrogen-15 ions. There are now five known isotopes of dubnium. The longest-lived is dubnium-262, with a half-life of 34 seconds.

PHYSICAL PROPERTIES

Density / g dm-3:-

Molar volume / cm3mol-1:-

Electrical resistivity / μΩcm:- (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m-1K-1:-

Melting point / °C:-

Boiling point / °C:-

Heat of fusion / kJ mol-1:-

Heat of vaporization / kJ mol-1:-

Heat of atomization / kJ mol-1:-

IONIZATION ENERGIES

First ionization energy / kJ mol-1:-

Second ionization energy / kJ mol-1:-

Third ionization energy / kJ mol-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:-

in the oceans / ppm:-

CRYSTALLOGRAPHIC DATA

 -

Crystal structure:

-

Unit-cell dimensions / pm:

-

Space group:

-

ISOTOPES

IsotopeRelative atomic massMass percent (%)

REDUCTION POTENTIALS

Balanced half-reaction Eo / V

 

104 Rutherfordium <=
105 Dubnium
=> 106 Seaborgium