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Actinium, atomic structure

Actinium, atomic structure

C045/6436

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53.2 MB (2.2 MB compressed)

4800 x 3872 pixels

40.6 x 32.8 cm ⏐ 16.0 x 12.9 in (300dpi)

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Credit

CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY

Caption

Diagram of the nuclear composition, electron configuration, and valence (outer electron) orbitals of an atom of actinium-227 (atomic number: 89), the most stable isotope of this element. The nucleus consists of 89 protons (blue) and 138 neutrons (red). 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.

Release details

Model release not required. Property release not required.

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