مصادر الكيمياء موقع لتعليم الكيمياء بصورة مبسطة
Isotopes: Isotopes are atoms of the same element having the same atomic number but different atomic masses. Note that the difference in the masses of isotopes is due to the different number of neutrons in their nuclei. Isotopes have the same chemical properties . because they have the same number of …
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