Cesium, or caesium, is an alkali metal on the periodic table with the atomic number 55. It is highly reactive and pyrophoric, meaning that the mere oxygen in the atmosphere is sufficient to make it go ...

Cesium is a rare, silver-white, shiny metal with brilliant blue spectral lines; the element's name comes from "caesius," a Latin word meaning "sky blue." It is the softest metal, with a consistency of ...

You could slice through the world's softest metal with a plastic spoon, but you probably wouldn't keep your hand. Cesium looks like warm gold, feels like candle wax, and reacts like a grenade. At room ...

Caesium (Cs) metal resembles rubidium and potassium. It is silvery white in appearance and is very soft and ductile. It is the most electropositive and most alkaline element. It oxidises easily in the ...

You’ve given some thought to oxygen, carbon, uranium. But you’ve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. The 5071A Cesium Primary Frequency ...