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Neutral isotopes of atom, state possible value for A & Z?

  1. Apr 3, 2015 #1

    CAH

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    A neutral atom of radium isotope may be represented by:
    228
    Ra (88 proton number, 228 nucleon number).
    88

    A
    Ra (A:nucleon number, Z: proton number).
    Z
    ...Is a neutral atom of different isotope of radium. State a possible value for A and for Z.

    I know that neutral means the number of protons will be the same as electrons so net charge=0 but Im confused as to why (in the mark scheme) it shows: 228 ± 10.
    I know the proton number will stay the same, but why is the nucleon number only plus or minus 10??

    Thanks
     
  2. jcsd
  3. Apr 3, 2015 #2

    PeterDonis

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    2016 Award

    Staff: Mentor

    Where does it show 228 ± 10?

    (Also, if this is a homework question, it should be posted in the appropriate homework forum and the homework template should be used. If it isn't, a reference for the source material you are getting this from would be helpful.)
     
  4. Apr 3, 2015 #3

    CAH

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  5. Apr 3, 2015 #4

    PeterDonis

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    2016 Award

    Staff: Mentor

    Exam questions are treated the same as homework here on PF. I have closed this thread; please re-post a new thread in the homework forum with the template filled out.
     
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