Ionic Compounds

Ionic Compounds

Ion: Any atom that has a charge

Cation:An ion with a + charge

anion:

An ion with a - charge

Ionic BondsA bond that forms between

(+) metals and (-) non metals.

Electrons are transferred and then the opposite

charges attract.

Octet RuleElement always move to

become more stable. Most elements change their

electron configuration to match the configuration of

noble gasses.

Elements want 8 valence electrons

1+

2+ 3+ 3- 2- 1-

Rules for Naming Ionic Compounds

1. The first element (metal) name does not change.2. The second elements name ending changes to -ide

NaO

MgCl2

Al2S3

Rules for Naming Ionic Compounds

(except for polyatomic ions, use the name on the chart)

SO42- = sulfate

Na2SO4 = sodium sulfate

Rules for Naming Ionic Compounds

3. If it is a transition metal Roman Numerals must be used.FeCl FeCl2 FeCl

3The Roman numeral tells you the charge of the transition metal

Rules for Naming Ionic Compounds

4. There are no prefixes in ionic compounds

Rules for Writing Ionic Compounds

1.Charge must always cancel out

+ and – charges add up to zero.2. Find the charges from the periodic table or the chart.

Rules for Writing Ionic Compounds

3.If the charges are the same they cancel out and it is a one to one ratio.

Ca2+ , O2- Ca1O1

Rules for Writing Ionic Compounds

4.If the charges are not the same then use the cross rule

Ca2+ Cl1-

Ca1Cl2