Thorium

Statistics:

• Name: Thorium
• Symbol: Th
• Classification: Actinides
• Atomic Number: 90
• Atomic Mass: 232.03806 g/mol
• Density: 11.72 g/cm³
• Melting: 1750°C
• Boiling: 4787°C
• Protons & Electrons:90
• Neutrons:142
• Discovered: 1829
• Discovered By: Berzelius
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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: 10
• Level 7: 2

Isotopes:

Isotope: Half-life

• ²²⁶Th: 30.57 minutes
• ²²⁷Th: 18.72 days
• ²²⁸Th: 1.9116 years
• ²²⁹Th: 7340 years
• ²³⁰Th: 7.538e+4 years
• ²³¹Th: 25.52 hours
• ²³²Th: 1.405e10 years
• ²³³Th: 22.3 minutes
• ²³⁴Th: 24.10 days

Brief Summary

Thorium is a Actinides with the symbol 'Th' and contains 90 Protons & Electrons with 142 neutrons in the nucleus of the atom. Thorium has an atomic mass of 232.03806 g/mol and, at a temperature of 20°C, has a density of 11.72 g/cm³. It will melt at a temperature of 1750°C and boil at 4787°C.

Thorium was discovered by Berzelius in 1829 and is named 'Thorium' After Thor, a Scandinavian god.

Some common usages for Thorium: strong alloys, ultraviolet photoelectric cells.

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

Thorium :: Th :: 90 - Chemical Element. 8 Sep. 2010 <http://www.chemicalelement.com/element/thorium.html>.