11 2 What Is A Lewis Symbol

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The document provides instructions for students on how to draw Lewis symbols to represent atoms in covalent bonding. It explains that Lewis symbols show the element's symbol in the center and dots around the outside to represent the number of valence electrons, which is determined by the group number on the periodic table. Examples are given to demonstrate how to draw the Lewis symbols for various elements like hydrogen, carbon, sulfur, and others by following the three step process of writing the symbol, determining valence electrons, and placing dots around the outside.

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  Grab your binder and find your new seat
Launch: 11/2

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Front
  Grab your binder and find your new seat
Launch: 11/2

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 Element’s symbol

Ne
•  • 

•  • 
Dot = 1 valence
electron •  •

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 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

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