Thallium Electron Configuration: 9 Facts You Should Know!

The chemical element thallium, or Tl, is a transition element. Let us talk about some more pertinent details about this element.

The electronic configuration of thallium is Xe54 4f14 5d10 6p1 which has the atomic number 81. It looks silvery white and weighs 204 g/mol in terms of its atomic composition. It is a member of group 13 in the periodic table. It has a metallic sheen that tarnishes when exposed to air.

The element’s electronic configuration, orbital diagram, electronic configuration notation, and a number of other topics are covered in more detail in this article.

How to write thallium electron configuration

Tl contains 81 electrons. The following rules must be followed in order to write the configuration of any element.

Thallium electron configuration diagram

On the basis of the following diagram, the electronic configuration of Tl can be explained. They are arranged in the increasing order of their energies.

Tl electronic configuration diagram

Thallium electron configuration notation

The electronic configuration notation of Tl is Xe54 4f14 5d10 6s2 6p1

Thallium unabbreviated electron configuration

The unabbreviated electronic configuration of Tl is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10  6p1.

Ground state thallium electron configuration

The ground state Tl electronic configuration is 1s2 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p1.

Excited state of thallium electron configuration

The excited state thallium electronic configuration is Xe54 4f14 5d10 6s2 6p0 .

Ground state thallium orbital diagram

Tl ground state orbital diagram

Thallium 1+ electron configuration

The electronic configuration of Tl1+ : Xe54 4f14 5d10 6s2 6p0 .

Thallium 3+ electron configuration

The electronic configuration of Tl3+ : Xe54 4f14 5d10 .

Condensed electron configuration of thallium

The condensed electronic configuration of Tl : Xe54 4f14 5d10 6s2 6p1 .


Nuclear radiography was primarily derived from the radioactive isotope Tl201 prior to the widespread use of technetium. However, thallium and its compounds are extremely toxic.

Mansi Sharma

Hello, viewers I am Mansi Sharma. I'm a medicinal chemist with a postgraduate degree. I love all facets of chemistry, and I do think that it is present everywhere, so let us explore what chemistry is all about together. Let us connect through LinkedIn

Recent Posts