Ionic Compounds
Tuesday, Jan. 6: Bonding Basics
A. Classify the following compounds as ionic
(metal and nonmetal) or covalent (nonmetal
and nonmetal).
1. CaCl2 ___________________________
2. NO3 ________________________________
3. K2O _____________________________
4. NaF ________________________________
5. CH4 _____________________________
6. P2O5 ________________________________
B. Use the Basic Monoatomic Ion Chart below to
answer the following questions.
1. How would you write the ion symbol for magnesium?
2. What do you call ions with negative charges?
3. What is the name for the anion with the symbol P3-?
4. What would be the name for NaCl?
January 06, 2015
Ionic Compounds
January 06, 2015
1. How would you write the symbol for copper (II)?
2. What is the name for the ion with the formula
Cr2+?
3. What is the name for the cation with the symbol
Hg2+?
4. What is the symbol for iron (III)?
Naming and Writing Ionic Compounds
Ionic Compounds
January 06, 2015
Review
Review: Ionic Compounds
• Positive Ion is called a CATION
> They are metals
• Negative Ion is called an ANION
> They are non-metals
Ionic Compounds
January 06, 2015
Ionic Compounds
• Notice the cross over of
charges
• The Cation is always
written FIRST, Anion
second
• Ionic compounds are
made up of metals and
non-metals, the metal is
written FIRST
Formation of Ionic Compounds
Criss Cross Method
Ca+2
+
Cl-1
CaCl2
Ionic Compounds
January 06, 2015
Formation of Ionic Compounds
Criss Cross Method
Naming Rules
• 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 3: Remember the crossing rule and
remember to reduce!
Ionic Compounds
January 06, 2015
Example
Ca+2 + Cl-1
Calcium + Chlorine => ide
Chloride
Example
CaCl2
Calcium
Chloride
Ionic Compounds
January 06, 2015
Multiple Ionic Charges & Names
• Some Transition metals can have more than one charge and
therefore more than one name.
Element name
Symbol
Ionic Charges
Roman numeral
Copper
Cu
+1, +2
I, II
Iron
Fe
+2, +3
II, III
Lead
Pb
+2, +4
II, IV
Tin
Sn
+2, +4
II, IV
When writing the names for
Transition Metals
Ionic Compounds
January 06, 2015
Learning Check
Polyatomic Compounds
Polyatomic ions: groups of atoms that are
chemically bonded together and carry an
overall ionic charge
Example: OH-1 (Hydroxide)
NH4+ (Ammonium)
Ionic Compounds
January 06, 2015
Polyatomic Compound Formulas
• Formulas for polyatomic compounds is determined the
same way as ionic compounds
• Cation first, Anion second
• Use Criss-Cross Rule
• Add parentheses for multiple polyatomics
Al+3 + CO3-2
Al2(CO3)3
Naming Polyatomic Compounds
• Step 1: Write the name of the metal cation first.
• Step 2: Write the name of the anion polyatomic ion
second.
• Step 3: Smile, you’re done!
Al+3 + CO3-2
Aluminum + Carbonate
Al2(CO3)3
Aluminum
carbonate
Ionic Compounds
January 06, 2015
IONIC CRISS CROSS
1. Na+1
N-3
3. Mg+2 CO3-2
5. Calcium fluoride
2. Ca+2
Cl-1
4. Fe+2
PO4-3
6. sodium oxide
STEP 1:
STEP 1:
STEP 2:
STEP 2: