Question:

Calculate the number of neutrons in 239Pu.?

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  1. 239 minus atomic number


  2. sorry im not going to do your homwork for you!

  3. Atomic number of Pu is 94 which means number of protones.

    According to this formula:

    Atomic mass= Atomic number + number of neutrones

         A=Z+n    n=?

    OK, so:

    Z=94 because it is number of protones    

    Atomic mass is 239 that you said------------->  A=239

    239=94+n ----------->>> n=239-94 --------->>    n=144

    Answer: number of neutrones is 144
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