Download - 10 28 How Many Electrons Do Atoms Gain Lose
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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!
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What do atoms form ions? Mr. Heffner 10/28/09
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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
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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
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Example: In an ionic bond, what ion would Cl form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
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Example: In an ionic bond, what ion would Cl form?
Step #1: metal or nonmetal? nonmetal = anion (–) gain electron
What ions do atoms form?
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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
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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
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Example: In an ionic bond, what ion would O form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
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Example: In an ionic bond, what ion would O form?
Step #1: metal or nonmetal? nonmetal = anion (–) gain electron
What ions do atoms form?
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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
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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
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Example: In an ionic bond, what ion would Na form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
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Example: In an ionic bond, what ion would Na form?
Step #1: metal or nonmetal? metal = cation (+) lose electron
What ions do atoms form?
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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
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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
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Example: In an ionic bond, what ion would Mg form?
Step #1: metal or nonmetal?
What ions do atoms form?
Metals
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Example: In an ionic bond, what ion would Mg form?
Step #1: metal or nonmetal? metal = cation (+) lose electron
What ions do atoms form?
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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
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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
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Why do atoms form ions? Atoms form ions to get 8 valence electrons
Opposites attract ionic bond
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Practice Questions Practice questions worksheet
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Homework Study for quiz!
Take home notes and practice questions from the past two weeks.
Look at exit slips online (lpschem.wordpress.com)