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Element symbol be1/21/2024 ![]() Element number 4 is produced by three countries at present: the United States, China, and Kazakhstan.However, expense and toxicity limits its use to high-end speaker systems. The element's rigidity and low weight make it ideal for speaker drivers. Beryllium oxide is an excellent thermal conductor and electrical insulator. It is a p-type dopant in semiconductors, which makes the element critically important for electronics. Beryllium is used in cell phones, cameras, analytical lab equipment, and in the fine-tuning knobs of radios, radar equipment, thermostats, and lasers.Beryllium is an element of military interest, since beryllium foil may be used in the production of nuclear weapons. The element is the main ingredient used to make the mirror for NASA's James Webb Space Telescope.Beryllium is used in x-ray tubes because its low atomic weight means it has a low absorption of x-rays.This is copper with the addition of a small amount of beryllium, which makes the alloy six times stronger than it would be as a pure element. One use of element atomic number 4 is in the production of beryllium copper.Trace amounts of beryllium are found in seawater and air, with slightly higher levels in freshwater streams. It is relatively rare in the Earth's crust, found at an abundance of 2 to 6 parts per million. Beryllium is not found in pure form in nature, but in combination with other elements.Beryllium resists oxidation in air and also resists concentrated nitric acid. ![]() It has the one of the highest melting points of the light metals.
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