Properties of The metal Cerium

On deciding on what metal to choose I did not want to use a common metal such as steel or aluminium,  our environment is unique and undiscovered, therefore I decided to choose a rare earth metal that found in the lanthanide series on the periodic table. 

The metal is called 'Cerium' 

Symbol: Ce
Electron configuration: Xe 4f1 5d1 6s2
Atomic number: 58
Melting Point: 795° C
Boiling point: 3,443° C
Atomic mass: 140.116 ± 0.001 u

It is a soft, ductile metal that easily oxidises in air, which gives a hint about our environment, it has no oxygen.