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The mass number of an element will depend on which isotope of that element is being considered. The element neon has three stable isotopes, and the mass numbers for them are 20, 21 and 22. This means that there will be 20Ne, 21Ne and 22Ne. Remember that all atoms of neon have 10 protons, regardless of which isotope. A link to the Wikipedia article on neon is supplied.

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17y ago

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