How Many Neutrons Does Cesium Have?

How Many Neutrons Does Cesium Have?

According to the Encyclopædia Britannica, naturally occurring cesium has 78 neutrons. Cesium only has one stable, nonradioactive isotope, cesium-133, which contains a nucleus of 55 protons and 78 neutrons. Other, less common isotopes exist with a varying amount of neutrons.

Cesium occurs naturally as a soft silvery metal. It is highly reactive and is the most electropositive and alkaline element.

Atomic cesium has an incredibly reliable microwave spectrum. This facet makes cesium a natural choice for clocks to provide the fundamental unit of time, with a reliability of 1 second in 1.4 million years. The NIST-F1 cesium clock, in Boulder, Colorado, is roughly the size of a railroad flatcar.