ساينس الصف الرابع الإبتدئي – الفصل الدراسي الاول In This part we will study : Elements : It is the simplest (pure) form of matter that cannot be decomposed into two substances or more. We will study : Firstly : properties of metals and non-metals Secondly: economic importance of some metals and non-metals بالتوفيق مستر احمد الباشا