Ionic Bonds and Ionic Compounds

Properties of Ionic Compounds•Solids at room temperature•Atoms arranged in a 3D pattern•High melting points•Conduct an electric current when melted

or dissolved in water

FluoriteCaF2Pyrite

FeS2

Review•Compound: two or more elements

chemically combined in a fixed ratio

Formation of Ionic Compounds•Composed of (non-metal) anions and

(metal) cations▫Example: Sodium Chloride

Formation Continued•Electrically neutral

Metal gives their electrons to the non-metal creating an ionic bond

Na Cl

So What’s Happening?

Na Cl+1

+1

Cation

Anion

Opposites Attract

Ionic Bonds•Want 8 valence/full outer shell•Example: Sodium Chloride

▫Sodium: 1s22s2sp63s1 Na

▫Chlorine: 1s22s22p63s23p5 Cl

Practice: Hydrogen and Bromine

Practice: Potassium and Iodine

Practice: Magnesium and Oxygen

Practice: Hydrogen and Oxygen (you may need more than one of each type of atom)

Practice: Hydrogen and Carbon (you may need more than one of each type of atom)

Practice: Potassium and Nitrogen (you may need more than one of each type of atom)

Practice: Calcium and Sulfur (you may need more than one of each type of atom)

One of the following pairs will form an ionic bond, one won’t. Draw out the one that will form the bond and describe why the other pair won’t bond.Lithium and Magnesium Zinc and Oxygen

Chemical Formula• A written representation of a substance

using symbols for its elements• Subscripts

• Show how many of each TYPE of atom are in the compound

• Example: Water H2O

Naming and Writing Formulas For Ionic Compounds

Binary Compound•Composed of

two elements•Can be ionic

or molecular

Chemical Formula forIonic Compounds•Formula Units

▫Lowest whole-number ratio of the ions in a compound

•Example:▫Sodium Chloride

Cinnabar

HgS

NaCl

Magnesium Chloride

Calcium Nitride

Naming Ionic Compounds•Cation FIRST

▫Keeps name of element•Anion SECOND

▫Add an –ide ending•Number of each element DOES NOT

MATTER

•Example: NaCl MgCl2Sodium Chloride

Magnesium Chloride

Hand out Common Ion List

What’s Going On?!Copper (i) Oxide Copper (ii) Oxide

Is it Cu+1 or Cu+2?CuS Cu2S

Grab a whiteboard and let’s practice!

Chemical Formula Practice: •What is the formula for Aluminum

Bromide?

Practice:•Predict the formula if Oxygen and

Potassium form an ionic bond.

Practice:•Predict the formula if Copper(ii) and

Nitrogen form and ionic bond.

One of the following pairs will form an ionic bond, one won’t. Draw out the one that will form the bond and describe why the other pair won’t bond.Argon and Oxygen Barium and Carbon

Practice: Write the correct formula for the compounds formed from each pair of ions

Potassium and Sulfur Calcium and Oxygen

Practice: Write the formulas for each compound

Barium Chloride Lithium Oxide

Practice: Which pairs of elements are likely to form ionic compounds?•A. Cl and Br

•B. Li and Cl

•C. K and He

•D. I and Na