Transcript L5-Sept.12-lewis

Question(s) 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) Here is a representation of a molecule of water (H2O).
Does it respect the principles behind Dalton’s atomic
model? Explain your answer.
2) Match a characteristic of the Rutherford-Bohr atomic model with
each of the following statements
a) An atom contains as many protons as electrons
a) Alpha particles pass easily through gold foil
Answers
1) Here is a representation of a molecule of water (H2O). Does it respect the
principles behind Dalton’s atomic model? Explain your answer.
No, this figure does not represent a
water molecule correctly according to Dalton’s atomic
model. Dalton believed that the atoms of different
elements have different masses and dimensions. The
hydrogen atoms should therefore look different from the
oxygen atom.
Answers
2) Match a characteristic of the Rutherford-Bohr
atomic model with each of the following
statements
a) An atom contains as many protons as
electrons
Answer:
An atom is electrically neutral
Answers
2) Match a characteristic of the Rutherford-Bohr
atomic model with each of the following
statements
b) Alpha particles pass easily through gold foil
Answer:
An atom is mostly empty space
What are we doing Today?
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QOD (question of day)
Workbook Questions: any questions?
Finish off families of periodic table
Representing atoms: Lewis Structures
Lewis structure worksheet
Molecule building fun
Day End Question(s)
What are we doing Today?
• Opportunity with Ecology & the
Environment
Alkaline Earth Metals
• They are never found uncombined in nature.
• They have two valence electrons.
• Alkaline earth metals include magnesium and
calcium, among others.
Halogen Family
• The elements in this family
are fluorine, chlorine,
bromine, iodine, and
astatine.
• Halogens have 7 valence
electrons
• Halogen atoms only need
to gain 1 electron to fill
their outermost energy
level.
Noble Gases
• Noble Gases are colorless gases that are extremely unreactive.
• One important property of the noble gases is their
inactivity. They are inactive because their outermost
energy level is full.
• Because they do not readily combine with other
elements to form compounds, the noble gases are called
inert.
Rare Earth Elements
• The thirty rare earth
elements are composed of
the lanthanide and actinide
series.
• Many are synthetic or manmade.
• (Plutonium)
Atoms are small. How do we
represent them?
Periodic Table Study Guide
How to Draw Lewis
Structures
Lewis Structures
1) Find your element on the periodic table.
2) Determine the number of valence electrons.
3) This is how many electrons you will draw.
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.
Groups - Review
Group 1 = 1 electron
Group 2 = 2 electrons
Group 8 = 8 electrons
Except for He, it has 2
electrons
•Each column is
called a “group”
•Each element in a
group has the same
number of electrons
in their outer orbital,
also known as
“shells”.
•The electrons in the
outer shell are called
“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
To Do
- Finish the lewis structure work page
- Make sure workbook is complete 3,4 & 7,8
- Have fun
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?
.
The proton
Answers
3) What are the elements in the second column
of the periodic table called?
.
Alkaline earth metals.
Answers
4) What are the elements in the far right column
of the periodic table called?
.
Noble Gases