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The Element Terbium


"The Atom"

Definition of the Terbium Element
A soft, silvery-gray metallic rare-earth element.  It is reasonably stable in air, but it is slowly oxidised and it reacts with cold water. It is used in x-ray and color television tubes. The Atomic Number of this element is 65 and the Element Symbol is Tb.

The Properties of the Terbium Element
Symbol of Element: Tb
Atomic Number: 65
Atomic Mass: 158.92534 amu
Melting Point: 1360.0 C - 1633.15 K
Boiling Point: 3041.0 C - 3314.15 K
Number of Protons/Electrons: 65
Number of Neutrons: 94
Crystal Structure: Hexagonal
Density @ 293 K: 8.27 g/cm3
Color: silvery-gray

Origin / Meaning of the name Terbium
Carl Gustaf Mosander was able to separate gadolinite into three materials, which he named yttria, erbia and terbia. The name derives from the "village of Ytterby" in Sweden, where the mineral ytterbite (the source of terbium) was first found.

Periodic Table Group and Classification of the of the Terbium Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Terbium is classified as an element in the Lanthanide series as one of the "Rare Earth Elements" which can located in Group 3 elements of the Periodic Table and in the 6th and 7th periods. The Rare Earth Elements are divided into the Lanthanide and Actinide series. The elements in the Lanthanide series closely resemble lanthanum, and one another, in their chemical and physical properties. Their compounds are used as catalysts in the production of petroleum and synthetic products. Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals.

Facts about the Discovery and History of the Terbium Element
Terbium was discovered by Carl Gustaf Mosander in Sweden in 1843

History of the Periodic Table
Check out the brief History of the Periodic Table which details dates and the names of famous scientists and chemists who contributed to the development of the Periodic Table.

Occurrence of the Terbium Element
Contained in many minerals, including cerite, gadolinite, monazite

Abundances of the element in different environments
% in Universe 510-8%
% in Sun 110-8%
% in Meteorites 3.910-6%
% in Earth's Crust 0.000093%
% in Oceans 1.410-11%
% in Humans N/A

Associated Uses of Terbium
Used to dope Calciumfluoride, calcium tungstate and Strontium molybdate
Used in alloys
Electronic devices
Fluorescent lamps
Color TV tubes

Site Index
Rare Earth Elements
List of Metals
Periodic Table

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