رد: تجمممع مـآآدة الكيممياء ( مناقشة - استفسارت - نماذج ... إلخ )
Rutherford,s experiment with alpha particle scattering by gold foil established that
(A) a chemical reaction involves the combination of atoms.
(B) compounds are composed of atoms of more than one element.
(C) the atom,s positive charges are concentrated in the nucleus.
(D) electrons have a negative charge.
هذا السؤال معنا؟؟؟ في منهجنا :(
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