Naming Naming Ionic CompoundsIonic Compounds

Ionic Compounds Ionic Compounds in waterin water

Water’s formula Water’s formula is His H22O.O.

Take a look at Take a look at pg 189 pg 189

Ionic CompoundsIonic Compounds

PositivePositive Ion Ion isis called a called a CATIONCATION. They are . They are metals.metals.

NegativeNegative Ion Ion is called an is called an ANIONANION. They are non-. They are non-metals.metals.

Ionic CompoundsIonic Compounds

Notice the cross Notice the cross over of over of ChargesCharges

The The CationCation is is always written always written FIRST, FIRST, Anion Anion Second.Second.

Ionic compoundsIonic compounds are made up of are made up of metalsmetals and and non-non-metalsmetals, the metal , the metal is written FIRST.is written FIRST.

Formation of Formation of Ionic CompoundsIonic CompoundsCrossing RuleCrossing Rule

CaCa+2+2 + + ClCl-1-1 CaCaClCl22

Naming RulesNaming Rules

Step 1: The name of the metal is Step 1: The name of the metal is written first, the same way it is written first, the same way it is written on the periodic tablewritten on the periodic table

Step 2: Write the name of non-metal Step 2: Write the name of non-metal second, second, BUTBUT change the ending of change the ending of the element to the element to –ide.–ide.

Step 3: Remember the crossing rule Step 3: Remember the crossing rule and remember to reduce! and remember to reduce!

ExampleExample

CaCa+2+2 ++ ClCl-1-1CaCaClCl22

Calcium + Chlorine => ide Chloride

Calcium Chloride

Note: Oxygen becomes oxide

Multiple Multiple Ionic Ionic Charges & Charges & NamesNames

Some Transition metals can have more than Some Transition metals can have more than one one chargecharge and therefore more than one and therefore more than one name.name.

Element nameElement name SymbSymbolol

Ionic Ionic ChargesCharges

Roman Roman numeralnumeral

CopperCopper CuCu +1, +2+1, +2 I, III, II

IronIron FeFe +2, +3+2, +3 II, IIIII, III

LeadLead PbPb +2, +4+2, +4 II, IVII, IV

TinTin SnSn +2, +4+2, +4 II, IVII, IV

When writing the namesWhen writing the names

Write the name of the element Write the name of the element followed by the Roman numeral.followed by the Roman numeral.

EX: EX: CuCu2+2+ is written is written Copper(II)Copper(II)So, what is the name of So, what is the name of FeFe3+3+ ??How would you write the name How would you write the name

of of PbPbClCl44??

Polyatomic CompoundsPolyatomic Compounds

What is a polyatomic ion?What is a polyatomic ion?

Polyatomic ions: groups of Polyatomic ions: groups of atoms that tend to stay atoms that tend to stay together and carry an together and carry an overall overall ionicionic chargecharge. See . See pg 196-197pg 196-197

Table of Common Polyatomic Table of Common Polyatomic IonsIons

Name of polyatomicName of polyatomic

ionionIonIon fomulafomula IonicIonic Charge Charge

NitrateNitrate NONO33-- -1-1

HydroxideHydroxide OHOH-- -1-1

Bicarbonate (hydrogen Bicarbonate (hydrogen carbonate)carbonate)

HCOHCO33-- -1-1

ChlorateChlorate ClOClO33-- -1-1

CarbonateCarbonate COCO33-2-2 -2-2

SulfateSulfate SOSO44-2-2 -2-2

PhosphatePhosphate POPO44-3-3 -3-3

AmmoniumAmmonium NHNH44++ +1+1

Polyatomic Compound Polyatomic Compound FormulasFormulas

Formulas for polyatomic compounds Formulas for polyatomic compounds is determined the same way as ionic is determined the same way as ionic compounds. compounds. CationCation first, first, Anion Anion second, cross over rulesecond, cross over rule

AlAl+3+3 + + COCO33-2-2 Al2(CO3)

Naming Polyatomic Naming Polyatomic CompoundsCompounds

Step 1: Write the name of the metal Step 1: Write the name of the metal first.first.

Step 2: Write the name of the Step 2: Write the name of the polyatomic ion second.polyatomic ion second.

Step 3: Smile, you’re done! Step 3: Smile, you’re done!