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Date: 26-12-2018
919
Date: 4-11-2018
1279
Date: 10-1-2019
920
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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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تفوقت في الاختبار على الجميع.. فاكهة "خارقة" في عالم التغذية
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أمين عام أوبك: النفط الخام والغاز الطبيعي "هبة من الله"
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قسم شؤون المعارف ينظم دورة عن آليات عمل الفهارس الفنية للموسوعات والكتب لملاكاته
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