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Launch: 10/28 Grab your binder and immediately take a seat
Place homework (storybook) on desk
Partner on left, read your story book Partner on right, just listen
Switch!
What do atoms form ions? Mr. Heffner 10/28/09
Why do atoms form ions? Want to be stable (like noble gases)
Octet rule: 8 valence electrons
Form ionic bonds to get 8 metals lose electrons cations (+) nonmetals gain electrons anions (–)
Cation Anion
What ions do atoms form? A three-step process for predicting ions:
Step #1: metal or nonmetal? Step #2: how far from the noble gases?
Step #3: write out the symbol and charge
Example: In an ionic bond, what ion would Cl form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
Example: In an ionic bond, what ion would Cl form?
Step #1: metal or nonmetal? nonmetal = anion (–) gain electron
What ions do atoms form?
Example: In an ionic bond, what ion would Cl form?
Step 2: how far away from the noble gases?
What ions do atoms form?
only 1 space away
Example: In an ionic bond, what ion would Cl form?
Step #3: write out the symbol and charge Step #1: anion (–) Step #2: 1 space away
What ions do atoms form?
Cl 1– Cl –or Chlorine gains an electron to become anion with a 1- charge
Example: In an ionic bond, what ion would O form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
Example: In an ionic bond, what ion would O form?
Step #1: metal or nonmetal? nonmetal = anion (–) gain electron
What ions do atoms form?
Example: In an ionic bond, what ion would O form?
Step 2: how far away from the noble gases?
What ions do atoms form?
2 spaces away
Example: In an ionic bond, what ion would O form?
Step #3: write out the symbol and charge Step #1: anion (–) Step #2: 2 spaces away
What ions do atoms form?
O 2–
Oxygen gains two electrons to become anion with a 2- charge
Example: In an ionic bond, what ion would Na form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
Example: In an ionic bond, what ion would Na form?
Step #1: metal or nonmetal? metal = cation (+) lose electron
What ions do atoms form?
Example: In an ionic bond, what ion would Na form?
Step 2: how far away from the noble gases?
What ions do atoms form?
only 1 space away
Example: In an ionic bond, what ion would Na form?
Step #3: write out the symbol and charge Step #1: cation (+) Step #2: 1 space away
What ions do atoms form?
Na 1+ Na +or Sodium loses an electron to become cation with a 1+ charge
Example: In an ionic bond, what ion would Mg form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
Example: In an ionic bond, what ion would Mg form?
Step #1: metal or nonmetal? metal = cation (+) lose electron
What ions do atoms form?
Example: In an ionic bond, what ion would Mg form?
Step 2: how far away from the noble gases?
What ions do atoms form?
2 spaces away
Example: In an ionic bond, what ion would Na form?
Step #3: write out the symbol and charge Step #1: cation (+) Step #2: 2 space away
What ions do atoms form?
Mg 2+
Magnesium loses two electrons to become cation with a 2+ charge
Why do atoms form ions? Atoms form ions to get 8 valence electrons
Opposites attract ionic bond
Practice Questions Practice questions worksheet
Homework Study for quiz!
Take home notes and practice questions from the past two weeks.
Look at exit slips online (lpschem.wordpress.com)
