Elements and Atoms https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/elements-and-atoms?v=IFKnq9QM6_A ---------------------------------------- يتناول هذا الفيديو توضيحاً وأمثلة حول تركيبة العناصر والذرات المختلفة ---------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org
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