Dubnium at Chemical Elements.com 


 

Basic Information


Name: Dubnium
Symbol: Db
Atomic Number: 105
Atomic Mass: (262.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 105
Number of Neutrons: 157
Classification: Transition Metal
Crystal Structure: Unknown
Density @ 293 K: Unknown
Color: Unknown
Other Names: Unnilpentium (Unp), Joliotium (Jl), Hahnium (Ha)


Atomic Structure

[Bohr Model of Dubnium]  
Number of Energy Levels: 7

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 32
    Sixth Energy Level: 11
    Seventh Energy Level: 2

Isotopes

Isotope Half Life
Db-258 4.2 seconds

Facts


Date of Discovery: 1970
Discoverer: Albert Ghiorso
Name Origin: After Dubna, Russia
Uses: No uses known
Obtained From: Man-made