Thallium is a chemical element with the atomic number 81 on the periodic table. It is a soft, malleable metal that is highly toxic and can be found in trace amounts in the Earth's crust.

Thallium was discovered in 1861 by Sir William Crookes and has a variety of uses in industry, including in electronics, optics, and the production of glass. However, due to its toxicity, thallium is not commonly used in consumer products.

Thallium has a number of isotopes, with thallium-205 being the most stable. Thallium is a relatively rare element, with an abundance in the Earth's crust of about 0.7 parts per million.

Thallium has a number of interesting properties, including its ability to conduct electricity and its tendency to form compounds with other elements. Thallium compounds have been used in a variety of applications, including as rat poisons and in the treatment of skin diseases.

Thallium is classified as a heavy metal and is highly toxic to humans. Exposure to thallium can lead to a variety of health problems, including neurological damage, gastrointestinal issues, and hair loss. In severe cases, thallium poisoning can be fatal.

Overall, thallium is a fascinating element with a number of unique properties. Its atomic number of 81 places it in the same group as elements such as lead and mercury. While thallium has some useful applications in industry, its toxicity makes it a dangerous substance to work with.

For more information on thallium and its properties, you can visit the Royal Society of Chemistry's website or the PubChem database. These resources provide detailed information on thallium's atomic structure, properties, and uses.

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