Atomic Number
105
Element 105
Dubnium (Db)
Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia, where it was first produced. It is a synthetic element and radioactive.
Atomic Mass
268 u
Category
Transition Metal
Period
7
Group
Group 5: vanadium group
Phase
solid
Density
29.3 g/cm3
Electron Shells
2, 8, 18, 32, 32, 11, 2
Atomic Structure
Protons: 105. Electrons: 105. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³
Why Dubnium Matters
Dubnium helps connect atomic number 105, transition metal behavior, period 7 trends, and electron shell structure. Its solid phase, atomic mass of 268 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Dubnium was discovered 1970 by Georgy Flerov, Albert Ghiorso. Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia, where it was first produced. It is a synthetic element and radioactive.
Safety and Handling Context
Dubnium has radioactive isotopes or is commonly discussed with radioactive materials. Use this page as an educational reference; real samples require qualified supervision and controlled handling.
Related Elements
Frequently Asked Questions
- What is the atomic number of Dubnium?
- Dubnium has atomic number 105, which means a neutral atom has 105 protons and 105 electrons.
- What is the chemical symbol for Dubnium?
- The chemical symbol for Dubnium is Db.
- What category is Dubnium in?
- Dubnium is classified as a transition metal and sits in period 7 of the periodic table.
Explore Dubnium in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Dubnium to neighboring elements without losing your place.