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The Element Actinium


"The Atom"

Definition of the Actinium Element
Actinium is a radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays. Actinium has the symbol Ac and atomic number 89.

The Properties of the Actinium Element
Symbol of Element : Ac
Atomic Number: 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: 89
Number of Neutrons: 138
Crystal Structure: Cubic
Density @ 293 K: 10.07 g/cm3
Color: Silvery

What is Actinium? Origin / Meaning of the name Actinium
The name originates from the Greek word 'aktinos' meaning ray or beam and is a one of the "Rare Earth Elements" found in the Actinide series of the Periodic Table.

What is Actinium? Periodic Table Group and Classification of the Actinium Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. 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. 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 Actinium Element
Actinium was discovered by Andre-Louis Debierne (14 July 1874 - 31 August 1949) in France in 1899. Friedrich Otto Giesel independently discovered actinium in 1902. Andr-Louis Debierne  was a French chemist and is considered the discoverer of the element actinium. Debierne was a close friend of Pierre and Marie Curie and was associated with their work.

What is Actinium? Occurrence of the Actinium Element
Actinium is found in trace amounts in uranium ore.

Abundances of the element in different environments
% in Universe N/A
% in Sun None
% in Meteorites N/A
% in Earth's Crust N/A
% in Oceans N/A
% in Humans None

Associated Uses of Actinium
A neutron source

Site Index
States of Matter
Rare Earth Elements
List of Metals
List of Metals
Periodic Law
Periodic Symbol

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