1. TOPIC: Ionic Bonding Do Now: Which terms are used to identify pure substances? A. an element and a mixture B. an element and a compound C. a solution and a mixture D. An mixture and a compound

2. MetalNonmetal Ionic: Metal + Nonmetal Metals: lose valence electrons –form cation –form cation (+ ion) Nonmetals: gain electrons anion –form anion (- ion) cation (+ ion)anion (- ion) Ionic: cation (+ ion) + anion (- ion)

3. IONIC BONDING Involves transfer of electronsInvolves transfer of electrons –Electrons Lost by Metal = Electrons Gained by Nonmetal Ions are formed (cation +)(anion -)Ions are formed (cation +)(anion -)

5. Review: Metals are losers! Na configuration 2-8-1 Ne configuration 2-8 Na loses 1 electron → Na +1 –Na +1 configuration is 2-8! (Ne) takeWhat will take the valence electron from Na?? A nonmetal Na metal 

6. Review: Nonmetals are winners! Cl configuration 2-8-7 Ar configuration 2-8-8 Cl gains 1 electron → Cl -1 –Cl -1 has the configuration 2-8-8! (Ar) donateWhat will donate an electron to Cl ?? Cl 2 (g)  A metal

7. electron transferred from Na to Cl

8. NOTE: the elements have very different physical properties than the compound they form

9. Since Ionic Compounds need + ion and – ion to form, they can actually contain more than one nonmetal or even be formed from all nonmetals if they have something called a polyatomic ion Turn to table E in your ref table K 2 SO 4 NH 4 Cl NH 4 NO 3

10. Polyatomic ion are ternary (containing 3 or more elements) -They are NOT neutral, they have a charge (either + or -) - they are covalently bonded (made of nonmetals only) SO 4 2- NH 4 1+ PO 4 3- OH -