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Date: 11-7-2018
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Date: 11-7-2018
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Date: 9-6-2019
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The alkaline earth metals are beryllium, magnesium, calcium, strontium, barium, and radium. Beryllium, strontium, and barium are rare, and radium is unstable and highly radioactive. In contrast, calcium and magnesium are the fifth and sixth most abundant elements on Earth, respectively; they are found in huge deposits of limestone and other minerals.
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5 علامات تحذيرية قد تدل على "مشكل خطير" في الكبد
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