Caesium, atomic structure

Caesium, atomic structure

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

Credit: SCIENCE PHOTO LIBRARY

Caption: Caesium (Cs). Diagram of the nuclear composition and electron configuration of an atom of caesium-133 (atomic number: 55), the most common isotope of this element. The nucleus consists of 55 protons (red) and 78 neutrons (blue). 55 electrons (green) bind to the nucleus, with a single, relatively unstable electron in the outer shell (ring). The stability of an element's outer electrons determines its chemical and physical properties. Caesium, used in atomic clocks, is an alkali metal in group 1, period 6, and the s-block of the periodic table. It is a soft, explosively reactive metal that is denser than water, melting at 28 degrees Celsius.

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