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How many neutrons does element X have if its atomic number is 23 and its mass number is 78?

How many neutrons does element X have if its atomic number is 23 and its mass number is 78?
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How many neutrons does element X have if its atomic number is 23 and its mass number is 78?

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User VanBrunneren
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1 Answer

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The element X has 55 neutrons.
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User Dave Bauman
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