Energy Levels and Bohr Model

1
Energy Levels and Bohr Model
By PresenterMedia.com
2
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.
3
Energy Levels

• Every atom has energy levels (also known as
  energy orbitals or valence shells) that hold the
  electrons.

Energy Level Maximum Electrons in valence shell Name of orbital
1
2
3
4
4
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.
5
Label the Energy Levels
6
Bohr Model

• The ________ has an atom consisting of a small,
  positively-charged nucleus orbited by
  negatively-charged electrons.

7
What are these elements?
Given the three Bohr Models before, determine
what element they are.
______________
______________
_________________
8
Drawing Bohr Diagrams
9
Bohr Diagrams

1. Find your element on the periodic table.
2. Determine the number of electrons it is the
   same as the atomic number.
3. This is how many electrons you will draw.

10
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.

www.chem4kids.com
11
Bohr Diagrams

1. Draw a nucleus with the element symbol inside.
2. Carbon is in the 2nd period, so it has two energy
   levels, or shells.
3. Draw the shells around the nucleus.

C
12
Bohr Diagrams

1. Add the electrons.
2. Carbon has 6 electrons.
3. The first shell can only hold 2 electrons.

C
13
Bohr Diagrams

1. Since you have 2 electrons already drawn, you
   need to add 4 more.
2. These go in the 2nd shell.
3. Add one at a time -starting on the right side and
   going counter clock-wise.

C
14
Bohr Diagrams

1. Check your work.
2. You should have 6 total electrons for Carbon.
3. Only two electrons can fit in the 1st shell.
4. The 2nd shell can hold up to 8 electrons.
5. The 3rd shell can hold 18, but the elements in
   the first few periods only use 8 electrons.

C
15
Bohr Diagrams

• Try the following elements on your own
• H
• He
• O
• Al
• Ne
• K

C
16
Hydrogen Atom
H

• Group ______________
• Period ______________
• Atomic of electrons _____________
• Metal, Non-Metal, or Metalloid?
  ___________________

17
Helium Atom
He

• Group ______________
• Period ______________
• Atomic of electrons _____________
• Metal, Non-Metal, or Metalloid?
  ___________________

18
Oxygen Atom
O

• Group ______________
• Period ______________
• Atomic of electrons _____________
• Metal, Non-Metal, or Metalloid?
  ___________________

19
Aluminum Atom
Al

• Group ______________
• Period ______________
• Atomic of electrons _____________
• Metal, Non-Metal, or Metalloid?
  ___________________

20
Neon Atom
Ne

• Group ______________
• Period ______________
• Atomic of electrons _____________
• Metal, Non-Metal, or Metalloid?
  ___________________

21
Potassium Atom
K

• Group ______________
• Period ______________
• Atomic of electrons _____________
• Metal, Non-Metal, or Metalloid? __________________

22
Bohr Diagrams

• Try the following elements on your own
• H 1 electron
• He
• O
• Al
• Ne
• K

H
23
Bohr Diagrams

• Try the following elements on your own
• H
• He - 2 electrons
• O
• Al
• Ne
• K

He
24
Bohr Diagrams

• Try the following elements on your own
• H
• He
• O - 8 electrons
• Al
• Ne
• K

O
25
Bohr Diagrams

• Try the following elements on your own
• H
• He
• O
• Al - 13 electrons
• Ne
• K

Al
26
Bohr Diagrams

• Try the following elements on your own
• H
• He
• O
• Al
• Ne - 10 electrons
• K

Ne
27
Bohr Diagrams

• Try the following elements on your own
• H
• He
• O
• Al
• Ne
• K - 19 electrons

K
28
Write in your Science Notebook.

1. Find your _______________ on the periodic table.
2. Determine the number of _______________ it is
   the same as the atomic number.
3. This is how many electrons you will ___________.
4. Find out which ______________________ your
   element is in. This will tell you how many energy
   levels, or ______________ you will need to draw.
5. Draw your electrons in a __________clock-wise
   pattern, always starting on the ___________.

29
Bohr Diagrams

• Draw a Bohr Diagram for the first 20 elements.