ساينس الصف الأول الاعدادي – الفصل الدراسي الاول ساينس اولي اعدادي ترم اول In This part we will study : The atom • It is the fundamental building unit of matter. • It is the smallest individual unit of matter which can share in chemical reactions. If the symbol of the element was : – One letter : It is written in capital. – Two letters : The first is written in capital and the second in small. Some elements are common in their initial letters, so the second letter is taken to differentiate between them, like : *Carbon (C) and Calcium (Ca) . * Sulphur (S) and Silicon (Si). * Hydrogen (H) and Helium (He). The element symbol is derived from its Latin name, so that symbols of some elements differ from their names in English language. لمتابعة مستر احمد الباشا وكل ما يخص الساينس : جروب الفيس بوك http://bit.ly/2Of1mcN صفحة الفيس بوك http://bit.ly/2Gq5xMo بالتوفيق مستر احمد الباشا