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Counting Atoms and Ionic Compounds Test Review Study guide Naming Ionic Compounds Check your Periodic Table of Elements to help you determine if the ion is positive or negative. The positive ion is first and the negative ion is second. In addition, the compound will end in –ide. Write the compound name on the line provided. Oxygen and Sodium ____________________________________________ Bromine and Aluminum _________________________________________ 5 Steps for Writing Ionic Compound Formulas Remember: the metal is first and then the non-metal 1. 2. 3. 4. 5. Write the symbols Write the charges Cross over the charges from top to bottom Remove the charges Simplify the numbers and remove the 1’s Lithium fluoride ___________________________________ Beryllium chloride __________________________________ Terms to know Subscripts are numbers used to tell you how many atoms of an element are in an equation Coefficients give the number of molecules involved in a reaction Reactant is what you start with in a chemical reaction Product is what you end up with at the end of the reaction 2 K + 2 H2O -----> 2 KOH + H2 (reactant) (product) Counting Atoms 1) write down the different elements in each compound. 2) write down how many of that particular atom there are 3) remember to use the subscripts and coefficients correctly 4C3H5(NO3)3 _____________________________________________________________________________________ Total ______________ 7(NH4)3PO4 _____________________________________________________________________________________ Total ______________ Write a Paragraph Description of NaCl Paragraph Description of Ionic Compounds Make sure your description contains all of the following items. Name the ionic compound Explain how many atoms are in the compound. (the subscript) Identify the metal and non-metal. Explain how many valence electrons each element has. Explain how the elements become stable once electrons have been taken. Final statement should contain the terms stable, opposite charges, attraction. Sodium chloride is an ionic compound. There is one atom of Sodium and one atom of Chlorine which make up one complete molecule of Sodium chloride. Sodium is a metal and Chlorine is a non-metal. Sodium has one valence electron and Chlorine has seven. Chlorine needs one more electron to have eight and become balanced or, happy. Sodium needs to lose the one valence electron to become happy. Once the valence electron has been lost by the metal and gained by the non-metal, they become attracted due to the positive and negative charges. Now they have combined to form a compound called Sodium Chloride.