Transcript Slide 1

Energy Levels and
Bohr Model
By PresenterMedia.com
•Energy Levels
Atoms are made of three subatomic particles:
__________, ____________, ___________
The ________ and _________ are located in
the nucleus and the ________ are found in
orbital shells.
The electrons in the outer orbital shells are
known as ________ _________.
They are bond one atom to another.
•Energy Levels
Every atom has energy levels (also known as energy
orbitals or valence shells) that hold the electrons.
Energy Level
1
2
3
4
Maximum Electrons in
valence shell
Name of orbital
The ________ ________ states that
atoms tend to combine in such a way
that they each have eight electrons in
their valence shells, giving them the
same electronic configuration as a
noble gas.
•Label the Energy Levels
•Bohr Model
•
The ________ has an atom consisting of a small, positivelycharged nucleus orbited by negatively-charged electrons.
•What are these elements?
Given the three Bohr Models before, determine
what element they are.
______________
_________________
______________
Drawing Bohr Diagrams
•Bohr Diagrams
1)
2)
3)
Find your element on the periodic table.
Determine the number of electrons – it is
the same as the atomic number.
This is how many electrons you will draw.
•Bohr Diagrams
Find out which period
(row) your element is
in.
• Elements in the 1st
period have one
energy level.
• Elements in the 2nd
period have two
energy levels, and so
on.
•
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•Bohr Diagrams
1)
C
2)
3)
Draw a nucleus with
the element symbol
inside.
Carbon is in the 2nd
period, so it has two
energy levels, or
shells.
Draw the shells
around the nucleus.
•Bohr Diagrams
1)
C
2)
3)
Add the electrons.
Carbon has 6
electrons.
The first shell can
only hold 2
electrons.
•Bohr Diagrams
1)
C
2)
3)
Since you have 2
electrons already
drawn, you need to
add 4 more.
These go in the 2nd
shell.
Add one at a time starting on the right
side and going
counter clock-wise.
•Bohr Diagrams
1)
2)
3)
C
4)
5)
Check your work.
You should have 6 total
electrons for Carbon.
Only two electrons can
fit in the 1st shell.
The 2nd shell can hold
up to 8 electrons.
The 3rd shell can hold
18, but the elements in
the first few periods only
use 8 electrons.
•Bohr Diagrams
Try the following
elements on your own:
a)
C
b)
c)
d)
e)
f)
H
He
O
Al
Ne
K
H
•Hydrogen Atom
Group: ______________
Period: ______________
Atomic # = # of electrons: _____________
Metal, Non-Metal, or Metalloid? ___________________
He
•Helium Atom
Group: ______________
Period: ______________
Atomic # = # of electrons: _____________
Metal, Non-Metal, or Metalloid? ___________________
O
•Oxygen Atom
Group: ______________
Period: ______________
Atomic # = # of electrons: _____________
Metal, Non-Metal, or Metalloid? ___________________
Al
•Aluminum Atom
Group: ______________
Period: ______________
Atomic # = # of electrons: _____________
Metal, Non-Metal, or Metalloid? ___________________
Ne
•Neon Atom
Group: ______________
Period: ______________
Atomic # = # of electrons: _____________
Metal, Non-Metal, or Metalloid? ___________________
K
•Potassium Atom
Group: ______________
Period: ______________
Atomic # = # of electrons: _____________
Metal, Non-Metal, or Metalloid? __________________
•Bohr Diagrams
Try the following
elements on your own:
a)
H
b)
c)
d)
e)
f)
H – 1 electron
He
O
Al
Ne
K
•Bohr Diagrams
Try the following
elements on your own:
a)
H
e
b)
c)
d)
e)
f)
H
He - 2 electrons
O
Al
Ne
K
•Bohr Diagrams
Try the following
elements on your own:
a)
O
b)
c)
d)
e)
f)
H
He
O - 8 electrons
Al
Ne
K
•Bohr Diagrams
Try the following
elements on your own:
a)
Al
b)
c)
d)
e)
f)
H
He
O
Al - 13 electrons
Ne
K
•Bohr Diagrams
Try the following
elements on your own:
a)
N
e
b)
c)
d)
e)
f)
H
He
O
Al
Ne - 10 electrons
K
•Bohr Diagrams
Try the following
elements on your
own:
a)
K
b)
c)
d)
e)
f)
H
He
O
Al
Ne
K - 19 electrons
•Write in your Science Notebook.
1.
2.
3.
4.
5.
Find your _______________ on the periodic
table.
Determine the number of _______________ — it
is the same as the atomic number.
This is how many electrons you will
___________.
Find out which ______________________ your
element is in. This will tell you how many energy
levels, or ______________ you will need to draw.
Draw your electrons in a __________clock-wise
pattern, always starting on the ___________.
•Bohr Diagrams
Draw a Bohr Diagram
for the first 20
elements.