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2014 INTRO IONIC BONDING.notebook September 12, 2014
ION PREDICTIONS POLYATOMIC IONS Gangs of Atoms that need electrons
look at the BACK of your PERIODIC TABLE...
carbonate phosphate chlorate hydroxide
ION GANGS
phosphite(eg)
metals:
nonmetals:
IONS
form positive ions (lose their dots)
form negative ions (gain dots) change suffix to ide
EG. Carbonate
CO
O
O
2014 INTRO IONIC BONDING.notebook September 12, 2014
MAKING IONIC COMPOUNDS
LEARNING GOALS:
• to learn why ionic compounds form• to write the proper formula for an ionic compound• to properly name ionic compounds
IONIC COMPOUNDS
metal + nonmetalgives away electrons
forms POSITIVE ION
picks up electrons
forms NEGATIVE ION
Question:
Why is the formula for sodium chloride NaCl....
.... but the formula for sodium oxide is Na 2O ??
Answer:
In every IONIC COMPOUND, the charges (ions) must BALANCE
the TOTAL NEGATIVE CHARGE must EQUAL the TOTAL POSITIVE CHARGE
2014 INTRO IONIC BONDING.notebook September 12, 2014
HOW DO WE WRITE THE PROPER FORMULA?
By Balancing the Charges (Ions)
eg. Write the Ionic Compound for aluminum chloride.
eg. Write the Ionic Compound for aluminum chlorate
(without drawing the lewis dots)???
3+
2
SODIUM OXIDEexample:
2+ 1
1+
2
2014 INTRO IONIC BONDING.notebook September 12, 2014