Radium, atomic structure

Radium, atomic structure

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


Caption: Radium (Ra). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of radium-226 (atomic number: 88), the most stable isotope of this element. The nucleus consists of 88 protons (red) and 138 neutrons (orange). 88 electrons (white) successively occupy available electron shells (rings). Radium is a radioactive alkaline earth metal in group 2, period 7, and the s-block of the periodic table. Formed in uranium ores, the Curies discovered it in 1898. Radium-226, once used in watches, has a half-life of 1061 years, with the unstable nucleus emitting an alpha particle to form radon-222.

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