Naming Ionic Compounds

Ionic Compounds in water Water’s formula is H 2 O. Water’s formula is H 2 O. Take a look at pg 189 Take a look at pg 189

Ionic Compounds Positive Ion is called a CATION. They are metals. Positive Ion is called a CATION. They are metals. Negative Ion is called an ANION. They are non- metals. Negative Ion is called an ANION. They are non- metals.

Ionic Compounds Notice the cross over of Charges Notice the cross over of Charges The Cation is always written FIRST, Anion Second. The Cation is always written FIRST, Anion Second. Ionic compounds are made up of metals and non- metals, the metal is written FIRST. Ionic compounds are made up of metals and non- metals, the metal is written FIRST.

Formation of Ionic Compounds Crossing Rule Ca +2 + Cl -1 CaCl 2

Naming Rules Step 1: The name of the metal is written first, the same way it is written on the periodic table Step 1: The name of the metal is written first, the same way it is written on the periodic table Step 2: Write the name of non-metal second, BUT change the ending of the element to –ide. Step 2: Write the name of non-metal second, BUT change the ending of the element to –ide. Step 3: Remember the crossing rule and remember to reduce! Step 3: Remember the crossing rule and remember to reduce!

Example Ca +2 + Cl -1 Ca +2 + Cl -1 CaCl 2 Calcium + Chlorine => ide Chloride Calcium Chloride Note: Oxygen becomes oxide

Multiple Ionic Charges & Names Some Transition metals can have more than one charge and therefore more than one name. Some Transition metals can have more than one charge and therefore more than one name. Element name Symbol Ionic Charges Roman numeral CopperCu +1, +2 I, II IronFe +2, +3 II, III LeadPb +2, +4 II, IV TinSn +2, +4 II, IV

When writing the names Write the name of the element followed by the Roman numeral. Write the name of the element followed by the Roman numeral. EX: Cu 2+ is written Copper(II) EX: Cu 2+ is written Copper(II) So, what is the name of Fe 3+ ? So, what is the name of Fe 3+ ? How would you write the name of PbCl 4 ? How would you write the name of PbCl 4 ?

Polyatomic Compounds

What is a polyatomic ion? Polyatomic ions: groups of atoms that tend to stay together and carry an overall ionic charge. See pg Polyatomic ions: groups of atoms that tend to stay together and carry an overall ionic charge. See pg

Table of Common Polyatomic Ions Name of polyatomic ion Ion fomula Ionic Charge Nitrate NO 3 - Hydroxide OH - Bicarbonate (hydrogen carbonate) HCO 3 - Chlorate ClO 3 - Carbonate CO Sulfate SO Phosphate PO Ammonium NH

Polyatomic Compound Formulas Formulas for polyatomic compounds is determined the same way as ionic compounds. Cation first, Anion second, cross over rule Formulas for polyatomic compounds is determined the same way as ionic compounds. Cation first, Anion second, cross over rule Al +3 + CO 3 -2 Al 2 (CO 3 )

Naming Polyatomic Compounds Step 1: Write the name of the metal first. Step 1: Write the name of the metal first. Step 2: Write the name of the polyatomic ion second. Step 2: Write the name of the polyatomic ion second. Step 3: Smile, you’re done! Step 3: Smile, you’re done!