2022: ☢️ Valence Electrons in Thallium (Tl) [& Facts, Color, Discovery ...

A valence electron is an outer shell electron and may participate in the formation of a chemical bond. Ok but how many valence electrons does an atom of Thallium have?

In the case of Thallium the valence electrons is 1,3. Now let's check the facts about Thallium...

Thallium Overview

Thallium Valence Electrons


Atomic Number


Learn more about the atomic number.

Atomic Mass


Learn more about the atomic mass.

Atomic Symbol


State at 20 °C



Soft gray metal that looks like lead.


Its compounds are used in rat and ant poisons. Also for detecting infrared radiation.

Name Origin

Greek: thallos (green twig), for a bright green line in its spectrum.


Found in iron pyrites. Also in crookesite, hutchinsonite and lorandite. Most is recovered from the byproducts of lead and zinc refining.


Discovered By: Sir William Crookes
Year: 1861
Location: England

Want to learn more details and data about Thallium (Tl)? Check my Elements Comprehensive List.


Are you having trouble understanding the basics of atomic elements? This video will walk you through:
  • What is an element
  • What is a substance
  • What Elements look like
  • How a small number of atoms can be joined and form completely different substances

Colored Periodic Table

Need an editable periodic table to edit? Maybe add your school logo, work team or anything else to maker your paper look cool?

Along with basic atom / element information (like Thallium valence electrons and all the other atomic data), it also comes with color coded info about: State (Gas, Liquid or Solid at room temperature), Groups/series details and much more...

How about an incentive to share this post? (You will help other colleagues find this blog)

Download and enjoy this complete and colored periodic table for you to edit and enjoy. It's in an editable excel format or .ods (open).
[lock][Download excel ##download##]
[Download open .ods format ##download##][/lock]


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That gives credibility to your paper and it is sometimes required in higher education.

To make your life (and citation) easier just copy & paste the information below into your assignment or essay:

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Now replace dd, mmmm and yyyy with the day, month, and year you browsed this page. Also replace URL for the actual url of this page (The < and > stay, ok?). This citation format is based on MLA.


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