Francium, atomic structure

Francium, atomic structure

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This image is part of the sequence science and technology: simple electron configurations of the elements


Caption: Francium (Fr). Diagram of the nuclear composition and electron configuration 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 (blue). 87 electrons (green) bind to the nucleus, successively occupying 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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