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Periodic Table of Elements

Element Dubnium – Db

Comprehensive data on the chemical element Dubnium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Dubnium. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one studies. Using the "Periodic Table of Elements Quick Navigation" graphic at the bottom of the sidebar menu, one can quickly jump from chemical element to chemical element.

Dubnium Menu

• Dubnium Page One
  • Overview of Dubnium
  • Dubnium's Name in Other Languages
  • Atomic Structure of Dubnium
  • Chemical Properties of Dubnium
  • Physical Properties of Dubnium
  • Regulatory / Health
  • Who/When/Where/How
• Dubnium Page Two
  • Nuclides / Isotopes
  • Potential Parent Nuclides

Overview of Dubnium

• Atomic Number:105
• Group: 5
• Period: 7
• Series: Transactinides

Dubnium's Name in Other Languages

• Latin: Dubnium
• Czech: Dubnium
• Croatian: Dubnij
• French: Dubnium
• German: Dubnium - s
• Italian: Dubnium
• Norwegian: Dubnium
• Portuguese:
• Russian:
• Spanish: Dubnio
• Swedish:

Atomic Structure of Dubnium

• Atomic Radius:
• Atomic Volume:
• Covalent Radius:
• Cross Section (Thermal Neutron Capture)_a/barns:
• Crystal Structure:

• Electron Configuration:

  1s² 2s²p⁶ 3s²p⁶d¹⁰ 4s²p⁶d¹⁰f¹⁴ 5s²p⁶d¹⁰f¹⁴ 6s²p⁶d³ 7s²

• Electrons per Energy Level: 2,8,18,32,32,11,2

  Shell Model
  

• Ionic Radius:
• Filling Orbital:
• Number of Electrons (with no charge): 105
• Number of Neutrons (most common/stable nuclide): 157
• Number of Protons: 105
• Oxidation States:
• Valence Electrons:

Chemical Properties of Dubnium

• Electrochemical Equivalent:
• Electron Work Function:
• Electronegativity: N/A (Pauling); N/A (Allrod Rochow)
• Heat of Fusion: kJ/mol
• Incompatibilities:

• Ionization Potential
  • First:
• Valence Electron Potential (-eV):

Physical Properties of Dubnium

• Atomic Mass Average: 262
• Boiling Point:
• Coefficient of lineal thermal expansion/K^-1: N/A
• Conductivity

  Electrical:
  Thermal: 0.58 W/cmK

• Description:

  Man made radioactive element.

• Flammablity Class:
• Freezing Point: see melting point
• Heat of Vaporization: kJ/mol
• Melting Point:
• Physical State (at 20°C & 1atm):
• Specific Heat:

Regulatory / Health

• CAS Number
  • 53850-35-4
• NFPA 704
  • Health:
  • Fire:
  • Reactivity:
  • Special Hazard: Radioactive
  <
  • OSHA Permissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSH Recommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm^-3: nil
    • Bone/p.p.m: nil
    • Liver/p.p.m: nil
    • Muscle/p.p.m: nil
    • Daily Dietary Intake: nil
    • Total Mass In Avg. 70kg human: nil

  Who / Where / When / How

  • Discoverer: the Joint Institute for Nuclear Research/University of Califorinia
  • Discovery Location: Dubna Russia (USSR)/Berkeley Califorinia
  • Discovery Year: 1970
  • Name Origin:

    After the city of Dubna Russia home to the Joint Institute for Nuclear Research

  • Abundance of Dubnium:
    • Earth's Crust/p.p.m.: nil
    • Seawater/p.p.m.: nil
    • Atmosphere/p.p.m.: nil
    • Sun (Relative to H=1E¹²): N/A
  • Sources of Dubnium:

    First synthisized by bombarding Am243 with Ne22. Only a small number of atoms of dubnium have ever been produced.

  • Uses of Dubnium:

    None

  • Additional Notes:

    In August of 1997 the International Union of Pure and Applied Chemistry announced the official naming of this element as Dubnium. Db-260 and Db-261 were tentatively reported in 1967 by scientists in Dubna Russia. It was not until 1970 that Db-260 had been confirmed by scientists in Dubna Russia and Berkeley Califorinia USA independantly. In 1992 the IUPAC concluded that credit for this discovery should be shared between the two groups of scientists.

  [Last update: 2/22/2007]

  Dubnium Menu

  • Dubnium Page One
    • Overview of Dubnium
    • Dubnium's Name in Other Languages
    • Atomic Structure of Dubnium
    • Chemical Properties of Dubnium
    • Physical Properties of Dubnium
    • Regulatory / Health
    • Who/When/Where/How
  • Dubnium Page Two
    • Nuclides / Isotopes
    • Potential Parent Nuclides

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