ساينس الصف الثاني الاعدادي – الفصل الدراسي الاول ساينس تانية اعدادي – ترم اول In This part we will study : 1. Alkali metals [group (1 A)] – They are located on the left side of the modem periodic table – They are the first group of s-block. General properties of alkali metals : (G.R) Sodium and potassium are kept under the surface of kerosene. To prevent them from the reaction with moist air as they are active metals . 2. Halogens [group (7A)] : – They are located on the right side of the modem periodic table before the inert gases. – They are elements of group 17 (7A) in p-block . General properties of halogens : Properties of elements and their uses : – Uses of elements depend on their properties . 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