What element has the symbol 'Cr'?

The story behind the answer

Cr is the symbol for Chromium. The other options have different symbols: Carbon is C, Cobalt is Co, and Copper is Cu (from its Latin name, cuprum). So only Chromium matches Cr.

Chromium (atomic number 24) is best known for giving stainless steel its corrosion resistance and for the shiny “chrome” finish on metal surfaces. Its name comes from the Greek chroma, meaning color, because chromium compounds produce vivid pigments (it even gives emeralds their green hue). Memory tip: Cr = ChRome—both letters appear at the start of “chrome,” the glossy coating made with chromium. Also remember: C is just Carbon, Co has the “o” for Cobalt, and Cu is the odd one from Latin for Copper.