caesium

The Simple English Wikipedia has an article on:

Caesium

xenon${\displaystyle \longleftarrow }$ 55 ${\displaystyle \longrightarrow }$barium

• cesium

• enPR: sē'zēəm, IPA ^(key): /ˈsiːziəm/, SAMPA: /"si:zi@m/

• Audio (US)

  (file)

1. (uncountable) Caesium is a chemical element that is a very soft silver-gold coloured alkali metal with the atomic number 55 and the symbol Cs.

   The atomic clock uses caesium to keep accurate time.