Chromium chemical symbol: Cr. Chromium main properties: Electronic structure: [Ar] 3d54s1 Atomic mass: 51,9961 u ± 0.0006 u Number: 24 Melting point: 1,907 ° C Discovery time: 1797. Boiling point: 2,672 ° CA applications of chromium: Used to make chromium coatings for corrosion protection, acid resistance and abrasion resistance.