Chrome

**Symbol:** Cr

**Atomic number:** 24

**International title:** chromium

**Relative Atomic Weight:** 51,996

**Information:** Chrome is the hardest metal. It is chemically very resistant. It is also resistant to external influences (it covers the oxide layer).

**Use:** It is used in the production of alloys (increases hardness and mechanical resistance). It is used in the manufacture of metals as a corrosion protection (plating). This is, for example, used in the treatment of surgical instruments.

**Occurrence:** In nature, it is relatively well represented. Its minerals include, for example, chromium or iron oxide chromium FeO·Cr₂O₃.

**Structure:** Chromium crystallizes into a cubic (cubic) system (a spatially centered cell).