Naming Ionic Compounds What is an Ionic Compound? •  Ionic bonding love story What is an Ionic Compound •  Ion –  An atom or molecule with electric charge due to the loss (+ve ion) or gain (-­‐ve ion) of one or more e-­‐ Another casualty in the War of Atoms What is an Ionic Compound? •  Ionic Bonding –  Transfer of e-­‐ from a metal to a non-­‐metal (usually) creaCng an electrostaCc bond between the two ions formed •  Ionic Compound –  A posiCve ion (caCon) and negaCve ion (anion) held Cghtly together by ionic bonding in a laDce structure Example LaDce Structure Ionic Compound? •  Write down whether or not the following compounds are ionic 1. 
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LiCl BeO CH4 C2N3 MgBr2 P2Br3 Naming Ionic Compounds •  Just like in our story… –  Metal ion = name stays the same –  Non-­‐metal ion = change ending to –ide •  The metal ion name comes first, then the non-­‐
metal. •  Examples: –  LiCl = Lithium Chloride –  BeO = Beryllium Oxide –  MgBr2 = Magnesium Bromide Try Naming These Compounds • 
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Li3N CaO ZnS AlP KI NaF Try Naming These Compounds • 
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Li3N = Lithium Nitride CaO = Calcium Oxide ZnS = Zinc Sulphide AlP = Aluminum Phosphide KI = Potassium Iodide NaF = Sodium Flouride Work on Worksheet WriCng Formula From Name 1.  Find the charge of each ion a)  Use the periodic table as your guide b)  How many valence electrons does each element have? 2.  Determine raCo between +ve and –ve ions 3.  Ex. Potassium Iodide a)  K = 1st group = 1 valence e-­‐ = 1+ charge b)  I = group 17 = 7 valence e-­‐ = 1-­‐ charge c)  RaCo = 1 to 1 so formula is simply KI WriCng Formulas From Names •  Ex. Write formula for Potassium Oxide –  K = 1+ –  O = group 16 = 6 valence e-­‐ •  So oxygen needs 2 e-­‐ for a full valence shell •  Therefore, oxygen’s charge is 2-­‐ –  RaCo = 1+ to 2-­‐ AH! That does balance out! –  To balance charge need 2 K for every 1 O –  So formula becomes K2O WriCng Formulas From Names •  What if we have higher equal charges?! •  Aluminum Nitride –  Aluminum ion = 3+ charge –  Nitrogen Ion = 3-­‐ charge –  So raCo = 3 to 3 –  Al3N3? Not quite… –  To make things simply, reduce like a fracCon –  AlN MulCvalent Ionic Compounds •  MulCvalent means –  MulC = more than one –  Valent = outer shell  referring to valence e-­‐ •  MulCvalent Metals –  Have mulCple amounts of valence electrons they can lose –  Therefore, can have more than one charge •  Ex. Fe2+ or Fe3+