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    This question is baffling me!:woo:

    When uranium-235 absorbs a neutron, it decays into two other elements and releases two neutrons.

    How does the mass number of an atom change when it absorbs a neutron?

    The answer is it increases by one, but why? Two more are given off, so surely it should decrease by one?

    can someone explain please?:confused:
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    As soon as it absorbs the neutron (ie, before it decays), its mass number will increase by 1, since that's the mass of a neutron. I think it was just the wording you found misleading.
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    Yeah the wording is weird.

    Think of the question as being seperate from the line before it.
 
 
 
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