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Date: 13-8-2018
1485
Date: 19-8-2019
1329
Date: 12-1-2022
1708
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The 12C isotope of carbon - which accounts for up about 99% of the carbons in organic molecules - does not have a nuclear magnetic moment, and thus is NMR-inactive. Fortunately for organic chemists, however, the 13C isotope, which accounts for most of the remaining 1% of carbon atoms in nature, has a magnetic moment just like protons. Most of what we have learned about 1H-NMR spectroscopy also applies to 13C-NMR, although there are several important differences.
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لصحة القلب والأمعاء.. 8 أطعمة لا غنى عنها
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في مدينة الهرمل اللبنانية.. وفد العتبة الحسينية المقدسة يستمر بإغاثة العوائل السورية المنكوبة
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