PRESENTATION OUTLINE
CS- symbol
55- atomic #
132.90545- atomic mass
•Group #1
•Properties: highly reactive, soft, easy to cut, 1 valence electron (6s^1) , +1, silvery-gold, ductile, pale,
•Density- 1.93 g•cm^–3
•Melting point- 28.5 degrees C (83.3 degrees F)
•Boiling point- 671 degrees C (1240 degrees F)
•Common isotopes- 137 (radioactive), 133, 134, 135
•Physical state at room temp- liquid
•Ionic radius- 165
•Electron configuration- [Xe] s1^1; 6s^1
•Electronegativity- 0.79
•Natural source- pollucite
•Abundance- 3 mg/kg
•2 uses- atomic clocks & propellant
•Discoverers- Robert Bunsen & Gustav Kirchhoff
•Date- 1860
•Location of discovery- Dürkheim, Germany
•Color- silvery-gold
7 other facts:
- in period 6
- crystal structure is cubic
- darkens with traces of oxygen
- very pyrophoric
- most important use is for research
- forms alloys with other alkali metals
- most electropositive stable element
