Actinium (Ac). Diagram of the nuclear composition and electron configuration of an atom of actinium-227 (atomic number: 89), the most stable isotope o
RMID:Image ID:2ACMRJM
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Science Photo Library / Alamy Stock PhotoImage ID:
2ACMRJMFile size:
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4579 x 4579 px | 38.8 x 38.8 cm | 15.3 x 15.3 inches | 300dpiDate taken:
2 May 2012Photographer:
Science Photo LibraryMore information:
Actinium (Ac). Diagram of the nuclear composition and electron configuration of an atom of actinium-227 (atomic number: 89), the most stable isotope of this element. The nucleus consists of 89 protons (red) and 138 neutrons (blue). 89 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). Actinium is an actinide in period 7, and the f-block of the periodic table. Actinides are soft radioactive metals. Actinium-227, isolated by Debierne from uranium ores in 1899, has a half-life of nearly 22 years. Its unstable nucleus decays by emitting a beta or alpha particle to form thorium-227 or francium-223.