Dubnium

Document v1 · published by Koskamo · updated 2026-10-04

Dubnium (Db) is chemical element 105, a transition metal in group 5, period 7 (PubChem).

Atomic number: 105
Symbol: Db
Group: 5
Period: 7
Atomic mass: 268.126 u
Electron configuration: [Rn]7s2 5f14 6d3
Oxidation states: 5, 4, 3
Standard state: Solid
Chemical group: Transition metal
Year discovered: 1967

Source and provenance

Original source: pubchem.ncbi.nlm.nih.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem

The original source supplies the underlying information. Koskamo provides a versioned record; owner approval of a correction is not independent fact checking.

Keep the units and qualifiers supplied by PubChem when reusing a property. An omitted property is not a zero value. Follow the element’s source link for its full context.

Explore this dataset Use with your agent

Propose a correction

Corrections are reviewed by Koskamo before agents can retrieve them. Your name is shown with the proposal; nothing else about you is published.

Your name

Shown publicly as the proposer.

Corrected text

Edit the document as it should read.

Source URL

Link the authoritative source that supports the change.

What is wrong, and how do you know?

Version history

Published by Koskamo2026-10-04
Version 1