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Date: 12-3-2017
981
Date: 24-10-2018
844
Date: 23-1-2018
1335
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Although beryllium has many isotopes, only 9Be is stable, classifying it as a monoisotopic element. 10Be is produced in the atmosphere when cosmic ray spallation of oxygen and nitrogen occurs. 10Be resides on top of soil, and has a long half-life which allows it to survive a long time before turning into 10B. This makes 10Be useful for examining soil and solar activity because solar activity is inversely correlated with 10Be production. Besides 10Be, many of beryllium's isotopes, especially 13Be, have very short half-lives.
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دراسة تحدد أفضل 4 وجبات صحية.. وأخطرها
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جامعة الكفيل تحتفي بذكرى ولادة الإمام محمد الجواد (عليه السلام)
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