Cesium ¶

AtomicNumber: 55

Element: Cesium

Symbol: Cs

AtomicMass: 132.905

NumberofNeutrons: 78

NumberofProtons: 55

NumberofElectrons: 55

Period: 6

Group: 1.0

Phase: solid

Radioactive: nan

Natural: yes

Metal: yes

Nonmetal: nan

Metalloid: nan

Type: Alkali Metal

AtomicRadius: 3.3

Electronegativity: 0.79

FirstIonization: 3.8939

Density: 1.87

MeltingPoint: 301.7

BoilingPoint: 944.0

NumberOfIsotopes: 22.0

Discoverer: Bunsen and Kirchoff

Year: 1860.0

SpecificHeat: 0.242

NumberofShells: 6

NumberofValence: 1.0