Dubnium (Db) – Periodic Table (Element Information & More)

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Dubnium (Db) element Periodic table

This is a SUPER easy guide on Dubnium element.

In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Dubnium element in Periodic table.)

So if you want to know anything about Dubnium element, then this guide is for you.

Let’s finish this very quickly.

Dubnium Element (Db) Information

State (at STP)Solid (predicted)
Position in Periodic tableDubnium in periodic table (Position)
Group: 5, Period: 7, Block: d
Categorydubnium element category
Transition metals
Atomic number or 
Protons		105
Neutrons157
Electrons105
SymbolDb
Atomic mass of Dubnium (most stable isotope) dubnium (Db) atomic mass
268 u
Electrons arrangement

or 

Bohr model		Bohr model of dubnium (Electrons arrangement in dubnium, Db)
2, 8, 18, 32, 32, 11, 2
Electronic configuration[Rn] 5f14 6d3 7s2
Crystal structure (predicted)crystal structure of dubnium
BCC (body centered cubic)
Density (predicted)21.6 g/cm3
Main isotope268Db
CAS number53850-35-4

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Dubnium in Periodic table

Dubnium element is in group 5 and in period 7 of the Periodic table. Dubnium is the d-block element and it belongs to transition metals group.

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Why is Dubnium in Period 7?

Why is Dubnium in Period 7

Let me ask you a question.

How many shells does a dubnium atom have?

It’s 7. Right? 

You have already seen the bohr model of dubnium atom in the above table.

From the Bohr model, it can be found that the number of orbits or shells in dubnium is 7. Hence, as dubnium has 7 orbits, it lies in period 7 of the Periodic table.

Why is Dubnium in d-block?

Why is Dubnium in d-block

Before knowing this reason, first of all I want to ask you a simple question.

How can you determine the blocks-wise position of elements?

The simple answer: The elements will lie in the s, p, d or f block will completely depend upon the subshell in which the last electron will enter.

For example; the electron configuration of dubnium is [Rn] 5f14 6d3 7s2. 

So the last electron of dubnium enters the d-subshell or d-orbital. 

Hence, dubnium is the d-block element.

5 facts about Dubnium

Interesting facts about dubnium element are mentioned below.

  1. The name of the element “dubnium” was derived from the town “Dubna” which is in Moscow, Russia.
  2. Dubnium was discovered individually by the researchers of Joint Institute for Nuclear Research (Russia), as well as researchers of Lawrence Berkeley National Laboratory (California).
  3. Dubnium is a radioactive  element that does not occur naturally, but it is prepared artificially in the laboratory.
  4. There are total of 7 known isotopes of dubnium and all those isotopes are radioactive in nature.
  5. Out of all the known isotopes, the isotope with the longest half-life is 268Db (with a half-life of 28 hours).

Properties of Dubnium

The physical and chemical properties of dubnium element are mentioned below.

  • Dubnium is a highly radioactive element and it is unstable.
  • The predicted crystal structure of dubnium is BCC (i.e body centered cubic).
  • The predicted atomic mass of dubnium is 268 u and its estimated density is 21.6 g/cm3.
  • According to researchers, the oxidation state +5 is more stable than the common oxidation states +2 and +3 which is generally seen in other elements preceding dubnium.

Uses of Dubnium

Dubnium is mostly used for scientific research work. It has no commercial uses due to its scarcity and a very short half-life.

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External resources:

  1. Dubnium – Element information, properties and uses | Periodic Table. (n.d.). Dubnium – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/105/dubnium
  2. Dubnium – Wikipedia. (2018, March 24). Dubnium – Wikipedia. https://en.wikipedia.org/wiki/Dubnium
  3. It’s Elemental – The Element Dubnium. (n.d.). It’s Elemental – the Element Dubnium. https://education.jlab.org/itselemental/ele105.html
  4. P. (n.d.). Dubnium | Db (Element) – PubChem. Dubnium | Db (Element) – PubChem. https://pubchem.ncbi.nlm.nih.gov/element/Dubnium
  5. Periodic Table of Elements: Los Alamos National Laboratory. (n.d.). Periodic Table of Elements: Los Alamos National Laboratory. https://periodic.lanl.gov/105.shtml
  6. C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – DUBNIUM. (n.d.). C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – DUBNIUM. http://pubsapp.acs.org/cen/80th/dubnium.html?
  7. Dubnium | CCDC. (n.d.). Dubnium | CCDC. https://www.ccdc.cam.ac.uk/elements/dubnium/

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