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  1. Abundance of elements in Earth's crust - Wikipedia

  2. Beryllium - Wikipedia

  3. Abundance of the chemical elements - Wikipedia

  4. Beryllium | Properties, Uses, & Facts | Britannica

  5. Beryllium - Element information, properties and uses | Periodic …

  6. Beryllium Statistics and Information | U.S. Geological Survey - USGS.gov

  7. WebElements Periodic Table » Beryllium » isotope data

  8. BERYLLIUM AND BERYLLIUM COMPOUNDS - Arsenic, Metals, …

  9. Facts About Beryllium - Live Science