Atomic Number 105
Dubnium (Db)
Group5
Period7
BlockD
State @ 25°CUnknown
Valence Electrons2 (d-block, variable in compounds)
Electron Config (Noble)[Rn] 7s2 5f14 6d3
105DbDubnium268
Tap related elements to compare trends across group and period.
Physical Properties
How this element behaves in real-world conditions.
- State (25°C)
- Unknown
- Density
- 29.3 g/cm³
- Melting Point
- Not available
- Boiling Point
- Not available
Atomic Structure
Core identity and periodic table positioning.
Electromagnetic Properties
How this element attracts and exchanges electrons.
- Electronegativity
- Not available
- Ionization Energy
- Not available
- Electron Affinity
- Not available
- Metallic Character
- Metal
Hero / Identity Section
Core identity profile for Dubnium with periodic placement and electron context.
- Element Name
- Dubnium
- Symbol
- Db
- Atomic Number
- 105
- Atomic Mass
- 268
- Group
- 5
- Period
- 7
- Block
- D
- Category
- Transition
- Standard State
- Unknown
- Electron Configuration (Full)
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d3
- Electron Configuration (Noble Gas)
- [Rn] 7s2 5f14 6d3
- Valence Electrons
- 2 (d-block, variable in compounds)
Quick Facts Card (Table Layout)
Fast-reference values for physical and energetic properties.
Atomic Radius
Not available in current dataset
Ionic Radius
Not available in current dataset
Electronegativity (Pauling)
Not available in current dataset
1st Ionization Energy
Not available in current dataset
Electron Affinity
Not available in current dataset
Density
29.3 g/cm³
Melting Point
Not available in current dataset
Boiling Point
Not available in current dataset
Heat Capacity
Not available in current dataset
Thermal Conductivity
Not available in current dataset
Visual Components
Visual learning views for table position, shells, orbitals, and phase behavior.
Highlighted Position in Periodic Table Grid
Db
Row 7, Column 5
Bohr Model Diagram
Db
Educational shell model for electron arrangement.
Electron Shell Diagram
- K shell2
- L shell8
- M shell18
- N shell32
- O shell32
- P shell11
- Q shell2
Orbital Configuration Diagram
1s2/2
2s2/2
2p6/6
3s2/2
3p6/6
4s2/2
3d10/10
4p6/6
5s2/2
4d10/10
5p6/6
6s2/2
4f14/14
5d10/10
6p6/6
7s2/2
5f14/14
6d3/10
Phase Illustration
Unknown
State uncertain
Atomic Structure Section
Nuclear composition and electron shielding interpretation.
- Protons
- 105
- Neutrons (Most Abundant Isotope Estimate)
- 163
- Electrons
- 105
- Electron Configuration Breakdown
- 2 • 8 • 18 • 32 • 32 • 11 • 2
- Shielding Explanation
- Core electrons (~103) shield part of the nucleus, reducing attraction felt by outer electrons compared with the full nuclear charge.
- Effective Nuclear Charge (Estimate)
- 2
Chemical Properties Section
Category-guided chemistry behavior with periodic context for comparison.
- Common Oxidation States
- Variable (often +2, +3, and higher/lower states depending on element)
- Reactivity Summary
- Moderate to broad reactivity range with strong dependence on oxidation state and ligands.
- Acid/Base Behavior
- Many oxides/hydroxides are amphoteric or weakly basic; behavior varies by element/state.
- Bonding Behavior
- Displays metallic, ionic, and coordination (complex) bonding patterns.
- Typical Compounds
- Oxides, Halides, Coordination complexes
- Periodic Trend Comparison (Group Neighbors)
- Compared with Ta, this element is lower in the group and typically has a larger atomic size and lower ionization tendency.
Isotopes & Nuclear Data
Isotope stability and abundance notes for learning-oriented nuclear context.
- Stable Isotopes
- No fully stable isotopes are known for this element.
- Radioactive Isotopes
- All known isotopes are radioactive.
- Natural Abundance (%)
- Usually trace-level or synthetic; natural abundance is limited.
- Half-life (If Applicable)
- Half-life varies by isotope and should be checked from isotope-specific references.
- Nuclear Spin (Optional Advanced)
- Advanced isotope-level data is not included in the current core dataset.
- Most Abundant Isotope (Estimate)
- Db-268
Applications & Uses
How this element appears in industry, biology, medicine, and technology.
- Industrial Uses
- Core materials for catalysts, alloys, structural metals, and chemical manufacturing.
- Biological Role
- Several transition metals are essential trace nutrients; excess can be toxic.
- Medical Use
- Used in diagnostics, implants, imaging agents, and therapeutic complexes.
- Technological Relevance
- Critical for electronics, catalysis, batteries, magnets, and manufacturing.
- Environmental Impact
- Can persist and bioaccumulate depending on element and oxidation state.
Safety & Handling
General hazard guidance for educational reference and lab awareness.
- Toxicity
- Toxicity spans low to high and is oxidation-state dependent; monitor exposure carefully.
- Flammability
- Bulk metals are generally low flammability; powders may be combustible.
- Storage Considerations
- Store according to specific oxidation state/compound hazards; avoid incompatible reagents.
- Regulatory Classification
- Often regulated by occupational exposure limits and compound-specific hazard classes.