Ionic Bonding and Criss-Cross Method
Text
TDQs
The Criss-Cross Method is a short cut to writing ionic bonds without Lewis dot
diagrams or Bohr models.
• You write the charges of the ions (using the periodic table)
• You criss cross (switch) the charges and ignore the + and – signs
1.
What is the Criss-Cross Method?
2.
How does naming and bonding
differ for transition metals?
3.
How does the criss-cross method
compare to drawing out Bohr
models or Lewis dot structures?
For example, the following provides a comparison of ionic bond formation:
aluminum + chlorine
On the other hand, transition metals work a bit different since they vary in # of
v.e- and their ionic charge. We use a roman numeral as part of their name and to
identify it’s ion charge:
Iron (II) = Fe +2
Cobalt (III) = Co +3
Zinc (II) Fluoride: ZnF2
Ionic Bonding and Criss-Cross Method
TEXT
The Criss-Cross Method is a short cut to writing ionic bonds without Lewis dot
diagrams or Bohr models.
• You write the charges of the ions (using the periodic table)
• You criss cross (switch) the charges and ignore the + and – signs
TDQs
1.
What is the Criss-Cross Method?
2.
How does naming and bonding
differ for transition metals?
3.
How does the criss-cross method
compare to drawing out Bohr
models or Lewis dot structures?
For example, the following provides a comparison of ionic bond formation:
aluminum + chlorine
On the other hand, transition metals work a bit different since they vary in # of
v.e- and their ionic charge. We use a roman numeral as part of their name and to
identify it’s ion charge:
Iron (II) = Fe +2
Cobalt (III) = Co +3
Zinc (II) Fluoride: ZnF2