Plural of cesium; multiple atoms or quantities of the chemical element cesium, a soft, highly reactive alkali metal.
From Latin caesius meaning 'bluish-gray,' referring to the color of the element's spectral line. Cesium was named by German chemist Bunsen in 1860 based on this distinctive blue coloration.
Cesium has one of the coolest properties of any element—atomic clocks use cesium atoms to keep time so accurately that they won't lose a second in 300 million years, making them the world's most precise timekeepers!
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