2Naming Ions Monoatomic ion – one atom with charge Ion – atom with chargecation- metals, location: left of periodic table, positive chargeanion – nonmetals, right of table, negative charge
3Predicting Ionic Charges Group 1A:Lose 1 electron to form 1+ ionsH1+Li1+Na1+K1+Rb1+Please point to other groups to have students recall valence electrons and determine the charge of the elements in each column.
4Predicting Ionic Charges The charge is sometimes referred to as the oxidation number or oxidation state
5Chemical names and Formulas There are three types of ionic compounds to write formulas for and nameBinary ionic compoundTransition metal compoundIonic compound containing polyatomic ionsCovalent compounds have a different naming systemIt uses prefixesAcids
6Chemical names and Formulas Binary ionic compounds are made up of only 2 different elementsThere can be more than 2 or more atoms thoughNaClK2OAl2S3
7To name a binary ionic compound Write the name of the cation first (always a metal)Write the name of the anion, but change the ending to –ideNote that any subscripts do not change the nameNaClsodiumchlorine → chloridesodium chloride
8Chemical Naming K2O Al2S3 Please do together as a class. Potassium oxide.Aluminum sulfide
9Name the following compounds WorksheetName the following compoundsKIMgOSrSBeF2Li2OAl2O3Cs3NBa3P2Have students name compounds in their notebooks.
10Writing Chemical Formulas To write formulas it is important to remember that the charges on the compound must be balancedSame total number of positive and negative chargesDetermine if the charges are balancedNaClLiOKIBeBrNaBr
11When charges are not balanced, it is necessary to add subscripts They represent the quantity of each elementNo subscript equals 1 atomLi+O2- the charges are not equalThere is only one positive and two negativesWe need another positive charge to make them equalLi2O
12Write formulas for the following compounds Sodium sulfidePotassium iodideCalcium bromideAluminum oxideBoron bromideRubidium selenideHave students write formulas in notebook.
13Writing Formulas for transition metals Sometimes the metal in a compound is a transition metalTransition metals can have various oxidation numbers or chargesFor example iron can be either Fe2+ or Fe3+Transition metals can move their electrons from the s to the d orbitals.This gives them various oxidation numbers or charges.