Elements of the periodic table with R

• Radium

  Radioactive metal, symbol Ra, discovered by the Curies.

• Rubidium

  Alkali metal, symbol Rb, soft and highly reactive.

• Radon

  Noble gas, symbol Rn, radioactive and colorless.

• Rhodium

  Precious metal, symbol Rh, used in catalysts.

• Ruthenium

  Transition metal Ru, used in electronics and alloys.

• rutherfordium

  Synthetic element Rf, named for Ernest Rutherford.

• Rhenium

  Transition metal Re, dense and heat‑resistant.

• Roentgenium

  Superheavy element Rg, honors Wilhelm Röntgen.

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