1. BY: NAYIRI BOGHOSSIAN CHEMISTRY PROJECT LESSON 9.2

2.  In the days before when someone discovered a new compound they would name it anything that would describe some property  Potassium Carbonate was (K 2 CO 3 ) which is named Potash it came from boiling wood ashes in iron pots.  The French chemist Antoine-Laurent Lavoisier and other chemists created the system of naming compounds. BACKGROUND

3.  Cation- Positive  Anion- Negative  Binary Compound is composed of two elements and can be either ionic or molecular.  To name any binary compound you must put the cation first then the anion.  To name a compound you would have to follow the rules. To name CuO, you would name this Copper Oxide, But it is incorrect.  Copper forms two cations. Oxide always has a 2- charge. Therefore it would be Cu 2 0. NAMING BINARY IONIC COMPOUNDS

4.  Charges of Monatomic anions can be determined from the periodic table.  Monatomic ions- consist of a single atom with a positive or negative charge resulting from the loss or gain of one or more valence electrons, respectively.  To balance a compound it has to have 8 electron in total. NAMING BINARY IONIC COMPOUNDS

6.  Write the symbol of the cation and then the anion. Add whatever subscripts are needed to balance the charges.  Positive charges must balance the negative charges so that the net ionic charge of the formula is zero.  Fe has a 3+ charge and 0 has a 2- charge  2(3+) + 3(2-)=0  Fe 2 O 3  Therefore this formula is correct because the overall charge of the formula is zero and the subscripts are in the lowest whole number ratio. WRITING FORMULAS FOR BINARY IONIC COMPOUND

7.  First, recognize that the compound contains poyatomic ion.  to name a compound containing a polyatomic, state the cation first and then the anion just as you did in naming binary ionic compounds.  Some ionic compounds containing polyatomic ions do not include a metal cation. NAMING COMPOUNDS WITH POLYATOMIC IONS