• Name: Cesium

  • Symbol: Cs

  • Number of Energy Levels: 6

  • Electrons on the outer energy level: 1

  • Atomic Number: 55

  • Atomic Mass: 132.9054 Amu

  • Protons / Electrons: 55

  • Neutrons: 78

  • Density: 1.873 g/cm3

  • Classification: Alkali Metal

Top 16 interesting facts about Cesium

  • Cesium (Caesium) was discovered in 1860 by Fustov Kirchoff. Its name derives from the Latin word "caesius" which means "blue sky".
  • Cesium's melting point is at 28.5 C (301.65 K, 83.3 F) and its boiling point is at 678.4 C (951.55005 K, 1253.12 F).
  • Cesium is a soft silvery-gold metal.
  • Cesium has the lowest hardness of all elements.
  • Cesium is liquid at room temperature.
  • Cesium is very reactive.
  • Cesium can form alloy with gold.
  • Cesium reacts with water under all conditions.
  • Cesium ignites in presents of air.
  • Cesium is the most electropositive stable chemical element.
  • Cesium is used in atomic clocks.
  • Cesium has 39 known isotopes.
  • Cesium has only one stable isotope 133-Cs which has 78 neutrons.
  • Cesium is the 45th most abundant element on Earth (36th most abundant metal).
  • Cesium is obtained mainly from pollucite ore.
  • The largest deposits of cesium are located in Canada (Bernic Lake, Manitoba).