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The table below gives the number of electrons, protons and neutrons in substances X, Y and Z. Study it and answers the questions that follow.

 Substance  Electrons  Protons  Neutrons 
    X 10  10   10
    Y 10   8   10
    Z  8   8    8
  1. Which letter represents an ion? 
  2. Which of the substances are isotopes? Give a reason. 
  3. Show the electron arrangement of Y 

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  1. Y
  2. Y and Z - Has the same number of protons but different number of Neutrons
  3.  
     Substance  Electrons  Protons  Neutrons 
        X 10  2:8:2  10   10
        Y 10  2:8:2   8   10
       Z  8  2:6   8    8
    2:8:2
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