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