Read More
Date: 20-12-2018
1073
Date: 4-12-2018
1148
Date: 19-10-2018
966
|
Isotopes of an element are atoms that have the same atomic numbers but a different number of neutrons (different mass numbers) in their nuclei. Selenium is known to have over 20 different isotopes; however, only 5 of them are stable. The five stable isotopes of selenium are 74Se, 76Se, 77Se, 78Se, 80Se.
|
|
علامات بسيطة في جسدك قد تنذر بمرض "قاتل"
|
|
|
|
|
أول صور ثلاثية الأبعاد للغدة الزعترية البشرية
|
|
|
|
|
وفد كلية الزراعة في جامعة كربلاء يشيد بمشروع الحزام الأخضر
|
|
|