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How many neutrons does an element have if its atomic number is 40 and its mass number is 156?
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How many neutrons does an element have if its atomic number is 40 and its mass number is 156?

User Marcuse
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116 neutrons.

To find the neutrons of an element, you simply have to subtract the mass number and atomic number. 156 - 40 is 116.

User Robert Crovella
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