Francium, atomic structure

Francium, atomic structure

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This image is part of the sequence science and technology: atomic structure and data for the elements

Credit: CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY

Caption: Francium (Fr). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of francium-223 (atomic number: 87), the most stable isotope of this element. The nucleus consists of 87 protons (red) and 136 neutrons (orange). 87 electrons (white) successively occupy available electron shells (rings). Francium is a radioactive alkali metal in group 1, period 7, and the s-block of the periodic table. Named after France, it was discovered in 1939 by Marguerite Perey. Francium-223 forms in uranium and thorium ores. It has a half-life of 22 minutes, emitting a beta or alpha particle from its unstable nucleus.

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