The Atom Worksheet - Answer Key

 

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  1. The  atom is the basic unit of matter.  It is made up of three components the proton, neutron, and electron. 

    2.  

     

  2. Protons are located in the nucleus and have a positive charge.  The number of protons defines the element.  When you change the number of protons you create a new element.

    3.  

     

  3. Electrons are located in the orbitals  and have a negative charge.  The electrons (primarily valence electrons) define the reactivity of the element.  When you change the number of electrons you create an ion.

    4.  

     

  4. Neutrons are located in the nucleus and have a neutral charge.  When you change the of neutrons you create an isotope. 

    5.  

     

  5. Define the components and how they would be determined in the chemical symbol

     

     

    A
    X
    Z

      6.  

    1. X
      X represents the chemical symbol of the particular element.

      2.  

    2. Z    
      Z represents the atomic number.

      3.  

    3. A
      A represents the mass number. 

     

     

  6. How many protons, neutrons and electrons are in each of the following?

      7.  

    1. 56Fe

      protons = 26
      electrons = 26
      neutrons = 30

      2.  

    2. 19F

      protons = 9
      electrons = 9
      neutrons = 10

      3.  

    3. 15N

      protons = 7
      electrons = 7
      neutrons = 8

      4.  

    4. 23Na

      protons = 11
      electrons = 11
      neutrons = 12

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