Actinium - Element Properties and Periodic Table Information

Actinium - An element from the Periodic Table based on the IOUPAC 1985 standard

Chemical Elements

Periodic Table

Definition of the Actinium Element
A radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays.

Origin / Meaning of the name Actinium
The name originates from the Greek word 'aktinos' meaning ray or beam.

Classification of the Actinium Element
Actinium classified as an element in the Actinide 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 of the Lanthanide and Actinide series. Most of the elements in the Actinide series are synthetic or man-made.

Facts about the Discovery and History of the Actinium Element
Actinium was discovered by Andre-Louis Debierne in France in 1899. Friedrich Otto Giesel independently discovered actinium in 1902.

Occurrence the Actinium Element
Actinium is found in trace amounts in uranium ore

Associated Uses of Actinium
A neutron source
Medicine

The Properties of the Actinium Element
Name of Element : Actinium
Symbol of Element : Ac
Atomic Number of Actinium : 89
Atomic Mass: (227.0) amu
Melting Point: 1050.0 °C - 1323.15 °K
Boiling Point: 3200.0 °C - 3473.15 °K
Number of Protons/Electrons in Actinium : 89
Number of Neutrons in Actinium : 138
Crystal Structure: Cubic
Density @ 293 K: 10.07 g/cm3
Color of Actinium : Silvery

Actinium and the Periodic Table
Check out Actinium on the Periodic Table which arranges each chemical element according to its atomic number, as based on the periodic law, so that chemical elements with similar properties are in the same column. Our Periodic Table is simple to use - just click on the symbol for Actinium for additional information and for an instant comparison of the Atomic Weight, Melting Point, Boiling Point and Mass - G/cc with any other element. An invaluable source of facts and information as a Chemistry reference guide.

Actinium - IUPAC and the Modern Standardised Periodic Table
The Standardised Periodic Table in use today was agreed by the International Union of Pure Applied Chemistry, IUPAC, in 1985 and now recognises more periods and elements than Dimitri  Mendeleev knew in his day but still all fitting into his concept of  the "Periodic Table" in which Actinium is just one element that can be found.
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The Element Actinium

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