2 Ions and Ionic BondsIon-atom or group of atom that has an electric chargeWhen an atom loses an electron it becomes…PositiveWhen an atom gains an electron is becomes…Negative
3 Polyatomic Ion-ions that are made of more than one atom Ionic Bond- the attraction between two oppositely charges particles
4 What has happened to sodium to give it a positive charge? IONCHARGESYMBOL/FORMULASodium1+Na+Magnesium2+Mg2+Chloride1-Cl-Sulfate2-SO42-What has happened to sodium to give it a positive charge?What has happened to chlorine to give it a negative charge?Which elements from the chart could from ionic bonds together?
5 Chemical Formulas and Names The combination of symbols that represent the ratio of elements in a compoundMgCl2CaCO3
6 NamingPositive ion comes first, then negative ionWhen the negative ion is a single element (like Cl-), the end of the name changes to –ideChlorine ChlorideIf the negative ion is polyatomic (like NO3-), the end of the name changes to –ate or –ite.NitrateFigure out the chemical formulas for the following ionic compounds using the chart on page 159Lithium oxidePotassium nitrate
7 **ions come together in a way that balances out the charges** Lithium OxideLithium = Lihas 1 valence electrons will lose 1 electron giving it a 1+ charge= Li+Oxygen = Ohas 6 valence electrons will gain 2 electrons giving it a 2- charge= 02-**ions come together in a way that balances out the charges**Li2O
8 Properties of Ionic Compounds Hard, brittle crystalsHigh melting pointsElectrical conductivity as a liquid