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Additional
actinium
English Wikipedia - The Free Encyclopedia
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Actinium
Actinium
is a radioactive
chemical element
with symbol
Ac
(not to be confused with the abbreviation for an
acetyl group
) and
atomic number
89, which was discovered in 1899. It was the first
non-primordial radioactive element
to be isolated.
Polonium
,
radium
and
radon
were observed before actinium, but they were not isolated until 1902. Actinium gave the name to the
actinide
series, a group of 15 similar elements between actinium and
lawrencium
in the
periodic table
.
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