كتل الذرات Mass of Atoms.

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Presentation transcript:

كتل الذرات Mass of Atoms

قارني قارني بين كيس يحتوى على حبة ذرة و بين كيس يحتوى على 1840 حبة ذرة !!

قارني بين كتل الجسيمات المكونة للذرة ؟؟ الكتلة ( وحدة كتلة ذرية ) (amu) الكترون .000549 بروتون 1.007276 نيوترون 1.008665 كتلة الالكترون هي اصغر من كتل البرتون و النيترون حوالي 1/1840 مرة .

وحدة الكتلة الذرية (amu)

وحدة الكتلة الذرية (amu) ماذا اعرف ماذا اريد ان اعرف ماذا عرفت

اقرئي الصورة ؟؟

هذه الكتل صغيرة جدا و يصعب التعامل بها . فكان لابد من ذرة معيارية وحدة الكتل الذرية هذه الكتل صغيرة جدا و يصعب التعامل بها . فكان لابد من ذرة معيارية هي ذرة الكربون ( الكربون -12)

وحدة الكتل الذرية )amu) تعرف بانها 1/12 من كتلة ذرة الكربون ( الكربون -12)

الكتلة الذرية لعنصر الكلور

(نسبة النظير )  = ( الكتلة ) الكتلة الذرية المتوسطة = القانون مساهمة الكتلة (نسبة النظير )  = ( الكتلة ) الكتلة الذرية المتوسطة = النظير 1+ النظير 2

حساب الكتلة الذرية المتوسطة للكلور Cl-35 حوالي 75.5 % Cl-37 حوالي 24.5% of 34.969 x 75.78 = 26.500 100 35.45 36.966 x 24.22 = 8.9532 LecturePLUS Timberlake 11

فسري لماذا الكتل الذرية ليست ارقاما صحيحة ؟؟ الكتل الذرية ليست ارقاما صحيحة لأنها تمثل المتوسط الموزون للكتل الذرية لنظائر العنصر جميعها في الطبيعة .

وحدة الكتل الذرية ماذا اعرف ماذا اريد ان اعرف ماذا عرفت

مثال(3-3) ص 87