Actinium

 

 

Name Actinium
Symbol Ac
Atomic Number 89
Atomic Mass 227.0 atomic mass units
Number of Protons 89
Number of Neutrons 138
Number of Electrons 89
Melting Point 1050.0° C
Boiling Point 3200.0° C
Density 10.07 grams per cubic centimeter
Normal Phase Solid
Family Rare Earth Metals
Period 7
Cost Unavailable

 

 

Origin of Name From the Greek aktinos, meaning ray
Date and Place of Discovery In 1899 in France and again in 1902 in France
Discovered by André-Louis Debierne (1899) and
F. Giesel (1902)
Common Compounds No known compounds
Interesting facts
  • It is extremely rare.
  • It was discovered in pitchblende residues after radium was extracted.
  • It is found in traces of uranium ore.
  • Its high radioactivity creates a glowing pale blue light.
  • It is about 150 times more radioactive than radium.
  • Its chemical behavior similar to lanthanum.
Common Uses
There are no significant applications outside the laboratory.

 

Photo Courtesy of
LennTech
Chemical Elements
Jefferson Lab
Mrs. Purdy's Web Page
Web Elements
Wikipedia


Actinium Atomic Structure Elements by Name Elements by Number Home