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William Crookes was the founder of finding the element Thallium

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Thallium - Video Learning - WizScience.com

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"Thallium" is a chemical element with symbol "Tl" and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it resembles tin, but discolors when exposed to air. Chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861, in residues of sulfuric acid production.

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Periodic table.com/elements/81/index.html

Https://www.hobart.k12.in.us/jams/periodic table/thallium.htm

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Poisonous thallium is element number 81. Its chemical symbl is Tl.

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Thallium is useful nowadays since it is used for images of blood flow to the heart and is used for electronic industry

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Rat poison,poison,image blood flow of heart,electronics,and insecticide

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Amount:37
Mass:176 to 212

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Melting:303.8C
Boiling:1473C
Density:11.8 g per cubic centimeter
Abundance:0.000053%

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Symbol:TI
Atomic#:81
AtomicMass:204.3833
Not found free in nature and resembles tin
A Medal
Family/group:transition & 13
GotName:from the Greek thallus meaning green twig