Do Now (7 minutes) In COMPLETE SENTENCES explain why an atom would turn into an ion (Why does it gain or lose electrons?). Hint: think about the octet rule.

Do Now Discussion Atoms lose/gain electrons and turn into ions to achieve a noble gas configuration  Same number of valence electrons as a noble gas (8)  Gains stability because its subshells are full

Naming Ionic Compounds 1/26/10 Cornell Notes Worksheet Race

What have we learned so far… Atoms lose or gain electrons to become ions Atoms turn into ions to achieve the same number of valence electrons (8) as a noble gas Transition metals can have more than one ion Cations and anions come together to form NEUTRAL ionic compounds

What we are learning today… How to NAME ionic compounds Example: NaCl = Sodium Chloride Why? It is important to identify compounds as a form of communication – so we know and others know what chemicals we are using.

How to Name an Ionic Compound Name of Cation Name of Anion The name of the cation comes first. The name of the anion comes second.

Step 1: Determine the Ions and their charges Example: NaCl Cation: Na  1 valence electron  Na + Anion: Cl  7 valence electrons  Cl -

Step 2: Name the cation Representative elements  element’s name Example: NaCl  Cation: Na +  Cation Name: Sodium Transition metal  element name and charge in roman numerals Example: FeCO 3  Cation: Fe 2+  Cation Name: Iron (II)

Step 3: Name the anion Representative element  (element’s name) – ide Example: NaCl  Anion: Cl -  Anion name: Chloride Polyatomic Ion  polyatomic ion’s name Example: FeCO 3  Anion: CO 3 2-  Anion name: Carbonate

Step 4: Put the names together Example 1: NaCl Cation: Anion: Compound Name: Example 2: FeCO 3 Cation: Anion: Compound Name: Sodium Chloride Sodium Chloride Iron (II) Carbonate Iron (II) Carbonate

Example 1: CaS Cation: Cation Name: Anion: Anion Name: Ca 2+ Calcium S 2- Sulfide CalciumSulfide

Example 2: Name the compound PbCl 2 Cation: Cation Name: Anion: Anion Name: Pb 2+ Lead (II) Cl - Chloride Lead (II)Chloride

Example 3: Name the compound AlPO 4 Cation: Cation Name: Anion: Anion Name: Al 3+ Aluminum PO 4 3- Phosphate AluminumPhosphate

Round Robin Start at Round 2! (Skip Round 1) Have Ms. Akagi check it before you move on to round 3 For full credit: finish at least 2 rounds For extra credit: first three students with all 4 rounds correct will get 2 points extra credit on the next quiz!

Homework Due Thursday 1/28 Writing formulas for ionic compounds Naming ionic compounds