1. Write the symbol for each atoms or ion. For example,
   3 protons, 2 electrons = Li⁺
   • 25 protons, 30 neutrons, 25 electrons
   • 94 protons, 150 neutrons, 94 electrons
   • 13 protons, 14 neutrons, 10 electrons
2. Give the name and symbol of the element represented by X for each of the following isotopes:

   • 188
     	X
     76

   • 34
     	X2-
     16

   • 85
     	X+
     37

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Chemistry Department
British Columbia Institute of Technology, Burnaby, B.C. Canada.
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