Presentation on theme: "Objectives To describe the formation of ions from their parent atoms"— Presentation transcript:
1 ObjectivesTo describe the formation of ions from their parent atomsTo learn to name ionsTo predict which ion a given element forms by using the periodic tableTo describe how ions combine to form neutral compounds+/- e-
2 A. IonsIn a chemical reaction atoms can form ions by gaining or losing electrons.Metals tend to lose one or more electrons to form positive ions called cations.Cations are generally named by using the name of the parent atom.
3 A. IonsNonmetals tend to gain one or more electrons to form negative ions called anions.Anions are named by using the root of the atom name followed by the suffix –ide.
4 A. IonsIon Charges and the Periodic TableThe ion that a particular atom will form can be predicted from the periodic table.Elements in Group 1 and 2 form 1+ and 2+ ions, respectivelyGroup 7 atoms form anions with 1- chargesGroup 6 atoms form anions with 2- chargesElements close to the sides of the Periodic Table gain or lose electrons to reach a “noble gas configuration”
6 IonsWhat ions would be formed from the elements with the following atomic numbers? Also what noble gas has the same number of electrons as these ions?533875588913
7 B. Compounds That Contain Ions Ions combine to form ionic compounds.Properties of ionic compoundsHigh melting pointsConduct electricityIf meltedIf dissolved in water
8 B. Compounds That Contain Ions Ionic compounds are electrically neutral. The pluses are balanced by the minusesThe charges on all the anions and cations in the compound must sum to zero / be in balance.Remember This
9 B. Compounds That Contain Ions Formulas for Ionic compoundsWrite the cation element symbol followed by the anion element symbol.The number of cations and anions must be correct for their charges to sum to zero.
10 Ionic CompoundsWhat compound would be formed by the following ions?Na+ and Cl- K+ and F-Fe3+ and P3- Na+ and S2-Mg2+ and Cl- Mg2+ and O2-Fe3+ and Cl- Na+ and P3-Fe3+ and S2- Mg2+ and N3-What would be the symbol of an ion of the isotope Nitrogen 15?