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د.محمود الشواربي
الذرة في خدمة الزراعة [EPUB ebook]

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的封面 د.محمود الشواربي: الذرة في خدمة الزراعة (ePUB)

تتكون المواد من جزيئات، وتتكون الجزيئات من عناصر، والعناصر من ذرات، وعلى هذا يمكن القول بأن الذرة هي وحدة العنصر ، وتتكون الذرة من نواة ( ( Nucleusيتركز فيها وزن الذرة، ويدور حول هذه النواة في محيطات خارجية عدد من الإلكترونات، التي يعتبر وزنها ضئيلا جدا بالنسبة إلى وزن نواة الذرة، وهذه الإلكترونات جميعا محملة بشحنة سالبة.
وتتكون نواة الذرة من عدد من البروتونات ( (Protons) وعدد من النيوترونات (Neutrons ) والبروتون هو جسيم صغير ثقيل نسبيا، محمَل بشحنة كهربائية موجبة، وأما النيوترون فيبلغ وزنه تقريبا وزن البروتون وهو متعادل كهربائياً، وذرة الأيدروجين تعتبر أبسط الذرات، وتتكون من بروتون واحد، وفي محيطها الخارجي إلكترون واحد.

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语言 阿拉伯 ● 格式 EPUB ● 网页 91 ● ISBN 9785269618487 ● 文件大小 0.8 MB ● 年龄 99-17 年份 ● 出版者 وكالة الصحافة العربية ● 市 London ● 国家 GB ● 发布时间 2024 ● 下载 24 个月 ● 货币 EUR ● ID 10089033 ● 复制保护 社会DRM

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