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What does the number next to isotopes signify?

What does the number next to isotopes signify?
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What does the number next to isotopes signify?

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User Sauumum
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The number next to the isotope is the mass number- They all have different masses because they have different numbers of neutrons, but the same amount of protons (Remember protons + neutrons = mass)
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User Pavel Orekhov
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It is an approximation of its mass number. Each isotope of an element has a different mass number.
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User Ius
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