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Free Mass number - protons and neutrons - Question Animation
Mass number - protons and neutrons - Question All atoms have a property known as their **mass number**, for example the most common isotope of carbon is carbon-12, which has a mass number of 12.
Mass number - protons and neutrons - Question All atoms have a property known as their **mass number**, for example the most common isotope of carbon is carbon-12, which has a mass number of 12.
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