Thallium

Statistics:

• Name: Thallium
• Symbol: Tl
• Classification: Poor Metals
• Atomic Number: 81
• Atomic Mass: 204.3833 g/mol
• Density: 11.85 g/cm³
• Melting: 303.6°C
• Boiling: 1457°C
• Protons & Electrons:81
• Neutrons:123
• Discovered: 1861
• Discovered By: Crookes
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 32
• Level 5: 18
• Level 6: 3

Isotopes:

Isotope: Half-life

• ²⁰⁰Tl: 26.1 hours
• ²⁰¹Tl: 72.912 hours
• ²⁰²Tl: 12.23 days
• ²⁰³Tl: stable
• ²⁰⁴Tl: 3.78 years
• ²⁰⁵Tl: stable
• ²⁰⁶Tl: 4.199 minutes
• ²⁰⁷Tl: 4.77 minutes
• ²⁰⁸Tl: 3.053 minutes
• ²⁰⁹Tl: 2.20 minutes
• ²¹⁰Tl: 1.30 minutes

Brief Summary

Thallium is a Poor Metals with the symbol 'Tl' and contains 81 Protons & Electrons with 123 neutrons in the nucleus of the atom. Thallium has an atomic mass of 204.3833 g/mol and, at a temperature of 20°C, has a density of 11.85 g/cm³. It will melt at a temperature of 303.6°C and boil at 1457°C.

Thallium was discovered by Crookes in 1861 and is named 'Thallium' Greek word "thallos" meaning "young shoot".

Some common usages for Thallium: rat and ant poisons, detecting infrared radiation.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Thallium :: Tl :: 81 - Chemical Element. 22 Nov. 2008 <http://www.chemicalelement.com/element/thallium.html>.