what is the thing inside of the atom who is positive charged, electron, proton, neutral, other, what is the thing inside of the atom who is negative charged, neutral, other, electron, proton, what is the thing in the atom that doesn't have a positive charge or a negative charge, electron, proton, other, neutral

بواسطة

لوحة الصدارة

النمط البصري

الخيارات

تبديل القالب

استعادة الحفظ التلقائي: ؟