المادة وتركيبها: العدد الكتلى والعدد الذرى

The video tutorial explains the concepts of mass and atomic numbers in chemistry, using the sodium atom as an example. It describes how the mass number is the sum of protons and neutrons, while the atomic number represents the number of protons. The tutorial also demonstrates how to calculate the number of neutrons by subtracting the atomic number from the mass number. This understanding is crucial for identifying and describing elements.

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