ساينس الصف الثاني الاعدادي – الفصل الدراسي الاول ساينس تانية اعدادي – ترم اول In This part we will study : Electronegativity It is the ability of the atom in covalent molecule to attract the electrons of the chemical bond towards itself. Electronegativity in periods By increasing the atomic number (from left to right) , the electronegativity increases . – The electronegativity of the elements of the same period is directly proportional to the atomic number. Electronegativity in groups By increasing the atomic number (from up to down) , the electronegativity decreases . The electronegativity of the elements of the same group is inversely proportional to the atomic number. Polar compounds They are covalent compounds in which the difference in electronegativity between their elements is relatively high . 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