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  1. Radium - Wikipedia

  2. Radium | Description, Properties, Symbol, Uses, & Facts

  3. Radium - Element information, properties and uses | Periodic Table

  4. Facts About Radium | Live Science

  5. Radium | NRC.gov

  6. Radium revealed: 120 years since Curies found the most …

  7. Radium Element | History, Uses, Facts, Physical Chemical …

  8. radium summary | Britannica

  9. Radium Facts and Chemical and Physical Properties - ThoughtCo

  10. Radium Facts - Element 88 Symbol Ra - Science Notes and Projects