Atomic number, mass number, and isotopes | Chemistry | Khan Academy

How to use the atomic number and the mass number to represent different isotopes

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Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.

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Видео Atomic number, mass number, and isotopes | Chemistry | Khan Academy канала Khan Academy Organic Chemistry