BR: Combining Objects A XY2 B XY CYZ D YZ2 RECORD as notes How many clothespins 
and how many articles 
of clothing do you see 
in A? B? C? D? A: one pair of pants and two clothespins B: one pair of pants and one clothespin C: one sock and one clothespin D: two socks and one clothespin CYZ D YZ2 A XY2 B XY X = pants Y = clothespins Z = sock

Today’s Standards H.C.3A.1 Construct explanations for the formation of molecular compounds via sharing of electrons and for the formation of ionic compounds via transfer of electrons. H.C.3A.2 Use the periodic table to write and interpret the formulas and names of chemical compounds (including binary ionic compounds, binary covalent compounds, and straight-chain alkanes up to six carbons). H.C.3A.3 Analyze and interpret data to predict the type of bonding (ionic or covalent) and the shape of simple compounds by using the Lewis dot structures and oxidation numbers.

Homework Complete ALL work - on time!

Science Connection Ionic compounds affect my everyday experiences, so I should be able to name and write formulas for these compounds Two types of ionic compounds Binary/monatomic vs. polyatomic

Names and Formulas for Ionic Compounds Writing formulas for ionic compounds Oxidation numbers (charge tells what is done with e; # tells how many e) Metals are positive they give electrons  Transition metals vary Nonmetals are negative they take in electrons  Group 13 is 3+  Group 14 is 4 ±  Group 15 is 5 ± and/or 3 ±  Group 16 is 2-  Group 17 is 1-  Group 18 is 0  does not have to give, take, or share e  to get 2 or 8 electrons in outer shell! 

cross Criss AlF 3 Al1 F3 Names and Formulas for Ionic Compounds Writing formulas for ionic compounds - Criss cross method Find the chemical formula for aluminum 
fluoride.  Al metal in Group 13; ox. #, 3+  fluoride is F nonmetal in Group 17; ox. #, 1- First is criss then there’s cross – criss cross 3+ 1-  Al F cross Criss   Al1 F3 AlF
3 3

cross Criss AlF 3 Al1 F3 Names and Formulas for Ionic Compounds B1 - 11/28 Names and Formulas for Ionic Compounds Writing formulas for ionic compounds - Criss cross method Find the chemical formula for aluminum 
fluoride.  Al metal in Group 13; ox. #, 3+  fluoride is F nonmetal in Group 17; ox. #, 1- First is criss then there’s cross – criss cross 3+ 1-  Al F cross Criss   Al1 F3 AlF
3 3

Names for Ions and Ionic Compounds Chemical nomenclature is a 
systematic way of naming 
compounds. Name the cation followed by the anion. For monatomic, cations use the element 
name. For monatomic anions, use the root element 
name and the suffix –ide. To distinguish between different oxidation 
states of the same element, the oxidation state 
is written in parentheses after the name of the 
cation. When the compound contains a polyatomic 
ion, name the cation followed by the name of 
the polyatomic ion. IUPAC Roman Numerals Check table

Names for Ions and Ionic Compounds Ionic compounds (M, NM) Metal followed by nonmetal; nonmetal ends in -ide Cations in the form of transition metals metal followed by (Roman numeral) in parentheses, 
followed by nonmetal with –ide ending. metals tend to give e, charge is positive  Example 1:  sodium and chlorine  metal, nonmetal ID the elements  chlorine becomes chloride  sodium chloride  Example 2 :  rust, Fe2O3  iron and oxygen  transition metal, nonmetal ID the elements  oxygen is in group 16; wants 2 more electrons  Iron wants to give 3 electrons   iron (III) oxide

Metallic and Nonmetallic Combinations When writing formulas for polyatomic ions,  use parentheses to keep the best friends together Check charge for ion’s oxidation 
number/state Metallic ions are + cations Nonmetallic ions are – anions Metal and nonmetal soooooo Criss Cross!! Example: Ammonium sulfate NH4 and  SO4 NH4 1+ SO4 2-    (NH4)2SO4

You Try These: Which subscripts would 
you most likely use for an 
ionic compound 
containing an alkali metal 
and a halogen? 
(Remember, 1 = no written subscript) A. 1 and 2 B. 2 and 1 C. 2 and 3 D. 1 and 1 What is the name of the 
compound CaOH? A. calcium oxide B. calcium (I) oxide C. calcium hydroxide D. calcium peroxide

You Try These: Which subscripts would 
you most likely use for an 
ionic compound 
containing an alkali metal 
and a halogen? 
(Remember, 1 = no written subscript) A. 1 and 2 B. 2 and 1 C. 2 and 3 D. 1 and 1 What is the name of the 
compound CaOH? A. calcium oxide B. calcium (I) oxide C. calcium hydroxide D. calcium peroxide

You Try These: Name these LiBr MgCl2 Al(OH)3 CuSO4 Give the formula for the following Iron (III) oxide Lead (IV) chromate Zinc nitrate Potassium chloride