Facts about the
Definition of the element Actinium
The Element Actinium is...
A radioactive element found in uranium ores, used in equilibrium
with its decay products as a source of alpha rays.
Interesting Facts
about the Origin and Meaning of the element name Actinium
What are the origins of the word Actinium ?
The name originates from the Greek word 'aktinos' meaning ray or
beam.
Facts about the
Classification of the Element Actinium
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.
Brief Facts about the
Discovery and History of the Element Actinium
Actinium was discovered by Andre-Louis Debierne in France in 1899.
Friedrich Otto Giesel independently discovered actinium in 1902.
Occurrence of Actinium in
the Atmosphere
Actinium is found in trace amounts in uranium ore
Associated Uses of
the element Actinium
A neutron source
Medicine
The Properties of the 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 Element and the Periodic Table
Find out more facts about Actinium on the Periodic Table which
arranges every 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 facts and
info and for an instant comparison of the Atomic Weight, Melting
Point, Boiling Point and Mass - G/cc of Actinium with any other
element. An invaluable source for more interesting facts and
information about the Actinium element and as a Chemistry reference
guide.
Facts and Info about
Argon - 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
which includes the Actinium element. The famous Russian Scientist, Dimitri Mendeleev, perceived the correct classification method of
"the periodic table" for the 65 elements which were known in his
time. The Standardised Periodic Table 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.
