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Chemistry Formation of Ions Name ________________________ Date _____________ Hour ______ #1. What is an ion? #2. 5 elements that form Cations... #4. Fill in this chart: Element Electron configuration (noble gas notation) Sodium Selenium Fluorine Magnesium Nitrogen Potassium Strontium Iodine Aluminum Beryllium #5.Explain why noble gases don’t form ions. #3. 5 elements that form Anions... Dot diagram Change in electrons Ion formed