11 2 what is a lewis symbol
TRANSCRIPT
Launch: 11/2 Grab your binder and find your new seat
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FernandoTaniaArthurBeccaAlissaBraulioAna EAmber
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Launch: 11/2 Grab your binder and find your new seat
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Launch: 11/2 Grab your binder and find your new seat
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Launch: 11/2 Ask your partner:
1. What is your name? 2. What did you do for Halloween?
3. What is one thing in Chem that you really understand? 4. What is one concept in Chem that you struggle with?
Schedule Monday (11/2): Covalent Bonds
Tuesday (11/3): Covalent Bonds
Wednesday (11/4): Covalent Bonds
Thursday (11/5): Covalent Bonds
Friday (11/6): Chemical Bonding Review
Monday (11/9): Chemical Bonding Review
Tuesday (11/10): Chemical Bonding Unit Exam!
Schedule We don’t have time to waste!
Follow our 6 class rules
If you have a question, ask! Ask your partner Ask me
Human Bonding Take out a new sheet of paper
Crunch it up into a ball
When instructed, stand up and walk around class Push in your chair
When the music stops, form a bond! Ionic – exchange electron Covalent – share electron
What is a Lewis symbol? Mr. Heffner 11/2/09
What is a Lewis symbol? Lewis symbols are…
used to represent atoms in covalent bonding
Ne Gilbert N. Lewis
• • • •
• • • •
Lewis Symbol
What is a Lewis symbol? Two pieces of information
The element Ne = Neon
The number of valence electrons 8 dots = 8 valence electrons
Ne • • • •
• • • •
Dot = 1 valence electron
Element’s symbol
What is a Lewis symbol? There is a 3-step process for creating Lewis
symbols: 1. Place element’s symbol in center 2. # of valence electrons? 3. Place electrons around symbol
Example Draw the Lewis symbol for hydrogen.
Step 1: Place element’s symbol in center
H
Example Draw the Lewis symbol for hydrogen.
Step 2: # of valence electrons?
Example Draw the Lewis symbol for hydrogen.
Step 2: # of valence electrons?
“The Trick”: Group #
group # = 1 # valence electrons = 1
Example Draw the Lewis symbol for hydrogen.
Step 3: Place electrons around symbol
H •
Example Draw the Lewis symbol for carbon.
Step 1: Place element’s symbol in center
C
Example Draw the Lewis symbol for carbon.
Step 2: # of valence electrons?
Example Draw the Lewis symbol for carbon.
Step 2: # of valence electrons?
“The Trick”: Group # Drop the 1!
group # = 14 # valence electrons = 4
Example Draw the Lewis symbol for carbon.
Step 3: Place electrons around symbol One on each of the 4 sides No doubling up!
C • • •
•
Example Draw the Lewis symbol for sulfur.
Step 1: Place element’s symbol in center
S
Example Draw the Lewis symbol for carbon.
Step 2: # of valence electrons?
Example Draw the Lewis symbol for sulfur.
Step 2: # of valence electrons?
“The Trick”: Group # Drop the 1!
group # = 16 # valence electrons = 6
Example Draw the Lewis symbol for sulfur.
Step 3: Place electrons around symbol One on each of the 4 sides Double up after all sides have at least one
S • • •
• • •
Practice Questions 1. Draw the Lewis symbols for:
i. Nitrogen ii. Fluorine
iii. Phosphorus iv. Xenon v. Calcium
vi. Iodine vii. Magnesium
viii. Arsenic ix. Sodium x. Silicon
Exit Slip 1. Unlike in ionic compounds, atoms in covalent
compounds a. share valence electrons to obtain a stable octet. b. are always a nonmetal and a metal. c. exchange valence electrons and form ions.
d. are always two metals.
Exit Slip 2. How many valence electrons does chlorine (Cl)
have? a. 17 b. 8 c. 2
d. 7
Exit Slip 3. Which of the following is the correct Lewis symbol
for oxygen?
Exit Slip 4. Bubble in A
Then, draw the Lewis symbol for iodine.
Exit Slip 5. Bubble in A
Then, draw the Lewis symbol for magnesium.
Homework Finish Lewis symbol and ions worksheet