Transcript L6-Sept.15-bohr-rutherford

Question of the Day Rules
• You must work alone
• You may NOT use your textbook today
• You have 5 minutes to complete the
QOD
Good luck!!
Questions of the Day
1) In the atomic model of potassium below,
which letter represents a valence electron?
Explain your answer.
2) What do elements of the same period have in common?
REPRESENTING ATOMS (pp. 26–29)
3)
How is Lewis notation useful?
Questions of the Day
1) In the atomic model of potassium below,
which letter represents a valence electron?
Explain your answer.
The letter D, because this electron is in
the outermost electron shell.
Answers
2) What do elements of the same period
have in common?
They have the same number of
electron shells in their atoms.
Answers
3) How is Lewis Notation useful?
.
Lewis Notation illustrates only the
valence electrons of an atom
What are we doing Today?
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Question(s) of the day
Lewis Review
Bohr Rutherford
Review Sheet  Assignment #1
Quiz (Wednesday)
Lab on Metals & Non-Metals (Thur)
DEQ (Day End Question(s))
Recycling Jobs
• Tomorrow Morning
• Remember to do your recycling jobs
• Smile 
Periodic Table Study Guide
How to Draw Lewis
Structures Review
REVIEW INFORMATION
Lewis Structures
• Find out which group
(column) your element is
in.
• This will tell you the
number of valence
electrons your element
has.
• You will only draw the
valence electrons.
Lewis Structures
1) Write the element
symbol.
2) Carbon is in the 4th
group, so it has 4
valence electrons.
3) Starting at the right,
draw 4 electrons, or
dots, counterclockwise around the
element symbol.
Lewis Structures
1) Check your work.
2) Using your periodic
table, check that
Carbon is in the 4th
group.
3) You should have 4
total electrons, or
dots, drawn in for
Carbon.
Lewis Structures
On your worksheet, try
these elements on your own:
a)
b)
c)
d)
e)
f)
H
P
Ca
Ar
Cl
Al
Lewis Structures
On your worksheet, try
these elements on your own:
a)
b)
c)
d)
e)
f)
H
P
Ca
Ar
Cl
Al
Lewis Structures
On your worksheet, try
these elements on your own:
a)
b)
c)
d)
e)
f)
H
P
Ca
Ar
Cl
Al
Lewis Structures
On your worksheet, try
these elements on your own:
a)
b)
c)
d)
e)
f)
H
P
Ca
Ar
Cl
Al
Lewis Structures
On your worksheet, try
these elements on your own:
a)
b)
c)
d)
e)
f)
H
P
Ca
Ar
Cl
Al
Lewis Structures
On your worksheet, try
these elements on your own:
a)
b)
c)
d)
e)
f)
H
P
Ca
Ar
Cl
Al
Lewis Structures
On your worksheet, try
these elements on your own:
a)
b)
c)
d)
e)
f)
H
P
Ca
Ar
Cl
Al
Atom Representation
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Lewis Structure
Bohr Rutherford Structure
Simplified
Ball & Stick
• The Bohr-Rutherford model of
the atom states that atoms are
composed of three subatomic
particles: protons, neutrons,
and electrons.
• Protons - heavy positively charged
particles found in the nucleus.
• The # of protons = the atomic
number of the Element.
Practice makes perfect! Find the
number of protons and neutrons for
the following elements:
Element
Lithium
Fluorine
Calcium
Helium
Argon
Potassium
# of protons
# of electrons
# of neutrons
How to draw a Bohr Rutherford
Diagram for Lithium
• Step 1: Find the number of
protons, neutrons, and electrons.
• protons • neutrons • electrons -
• Step 2 - Draw your nucleus and
include in there the number of
protons and neutrons for your
element.
• Step 3 - Place your electrons on the
orbits as "dots". Remember that the
first shell can only hold 2 electrons,
while the second and third can both
hold 8 electrons.
Draw:
Practice makes perfect
• Draw proper Bohr diagrams for the following
elements:
• (a) Berylium
• (b) Oxygen
• (c) Neon
• (d) Sodium
What to do now?
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Finish Lewis Structure Page
Finish Bohr Rutherford Practice Page
Assignment 1
Show up on Wednesday for lab prep
Study for quiz on Wednesday
QUIZ
(What will it be on?)
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The Atom
Lewis Structures
Bohr Rutherford Structures
Periodic Table of the Elements
Day End Question (DEQ)
1) Which positively charged particle is found in
the nucleus?
2) What are the elements (family) in the second
column of the periodic table called?
2) What are the elements (family) in the far
right column of the periodic table called?
Answers
1) Which positively charged particle is found in
the nucleus?
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The proton
Answers
3) What are the elements in the second column
of the periodic table called?
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Alkaline earth metals.
Answers
4) What are the elements in the far right column
of the periodic table called?
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Noble Gases