cesium

noun
  1. A soft, silvery-gold alkali metal with the atomic number 55, known for being highly reactive and having a low melting point. It is used in atomic clocks, photoelectric cells, and various other applications. noun
    Cesium is often used in atomic clocks due to its precise frequency standards.
    The reactivity of cesium makes it useful in photoelectric cells.
  2. A chemical element symbolized as Cs, which is one of the most electropositive and alkaline elements, often used in the production of electricity and electronics. noun
    Cesium is symbolized as Cs on the periodic table.
    Due to its electropositive nature, cesium is used in various electronic applications.