What Is Dubnium?

Dubnium, symbol Db and atomic number 105, belongs to the transition metals — the wide central block known for hardness and multiple oxidation states.

Named after Dubna, Russia. A highly radioactive synthetic element.

As a transition metal in Period 7 and Group 5 (Transition Metals), dubnium's placement on the table reflects its electron configuration of [Rn] 5f¹⁴ 6d³ 7s², which governs its bonding behavior and the type of compounds it typically forms.

Position on the Periodic Table

Dubnium is located in Period 7, the bottom row of the standard periodic table, consisting largely of radioactive and synthetic elements.

Within that row, dubnium sits in Group 5 (Transition Metals), alongside elements that share a similar number of valence electrons and, by extension, similar chemical behavior.

This position is not arbitrary — the periodic table was deliberately organized so that an element's row and column reveal its expected reactivity, bonding pattern, and physical state at a glance.

Physical & Chemical Properties

Dubnium has an atomic mass of (268) u and a density of ~29 g/cm³.

Dubnium is malleable and ductile in its pure metallic form, and like other transition metals it can typically form more than one stable oxidation state.

Electron Configuration Explained

Dubnium's electron configuration is [Rn] 5f¹⁴ 6d³ 7s², describing how its electrons are distributed across shells and subshells around the nucleus.

Reading the configuration in order shows electrons filling shells of increasing energy, following the standard Aufbau principle that explains how atomic structure builds up across the periodic table.

The outermost (valence) electrons shown in this configuration are what ultimately determine dubnium's chemical reactivity and the type of bonds it forms with other elements.

History & Discovery

Dubnium was formally discovered in 1970, Ghiorso/Flerov, identified through the careful isolation and analytical techniques typical of that era's chemical research.

Many elements from this period were anticipated by Dmitri Mendeleev's periodic table, which successfully predicted gaps corresponding to undiscovered elements well before laboratory instruments existed to confirm them directly.

What Is Dubnium Used For?

Dubnium's specific properties make it useful in several applications, including:

  • Research only
  • Nuclear physics
  • Scientific study
  • No practical uses
  • Academic research

These uses reflect dubnium's underlying classification as a transition metal, since the same properties that define its category in chemistry also determine where it becomes practically useful.

Fun Facts About Dubnium

  • Dubnium was simultaneously discovered by Soviet and American teams during the Cold War.
  • Dubnium is element number 105 on the periodic table, in Period 7 and Group 5.
  • Its standard atomic mass is (268) u, calculated from the natural abundance of its isotopes.

Frequently Asked Questions

What is Dubnium's atomic number?
Dubnium has atomic number 105.

What is Dubnium's chemical symbol?
Dubnium's symbol is Db.

What group and period is Dubnium in?
Dubnium is in Period 7, Group 5 (Transition Metals).

What is Dubnium's atomic mass?
Dubnium's standard atomic mass is (268) u.