Drawing Bohr Models
and Lewis Dot Structures
Bohring
Bohr Models
 Used
to predict reactivity in elements
Reactivity - how likely an element is to form
a compound with another element, based
on valence electrons
Drawing Bohr Models
1.
Draw the nucleus.
Drawing Bohr Models
1.
2.
Draw the nucleus.
Write the number of Protons and
Neutrons in the nucleus
P:9
N:10
Drawing Bohr Models
3.
Draw the first shell
P:9
N:10
Drawing Bohr Models
3.
4.
Draw the first shell
Add the electrons, the first shell
can only hold 2
P:9
N:10
Drawing Bohr Models
Draw the next shell if you
have more electrons to add
5.
P:9
N:10
Drawing Bohr Models
Add your electrons, the 2nd
shell can hold up to 8
6.
P:9
N:10
Be sure to add them one at a time
going clock wise.
Rules for Energy Levels
Keep adding shells until you use up all of
your electrons. Here is how many each shell
holds:
Shell 1: 2
Shell 2: 8
Shell 3: 18
Shell 4: 32
Guided Practice
It is easiest to figure out your protons, neutrons and
electrons and then draw.
6
C
Carbon
12.011
6
6
6
Protons: _____
Neutrons: _____
Electrons: ______
2
How many energy shells will this have? ____
4
How many valence (outer) electrons does this element have? ____
Bohr Model:
Guided Practice
16
S
Sulfur
32.066
16
16
16
Protons: _____
Neutrons: _____
Electrons: ______
3
How many energy shells will this have? ____
6
How many valence (outer) electrons does this element have? ____
Bohr Model:
Guided Practice
3
Li
Lithium
6.941
3
4
3
Protons: _____
Neutrons: _____
Electrons: ______
2
How many energy shells will this have? ____
1
How many valence (outer) electrons does this element have? ____
Bohr Model:
Guided Practice
10
Ne
Neon
20.180
10
10
10
Protons: _____ Neutrons: _____ Electrons: ______
2
How many energy shells will this have? ____
8
How many valence (outer) electrons does this element have? ____
Bohr Model:
Guided Practice
15
P
Phosphorus
30.974
15
16
15
Protons: _____
Neutrons: _____
Electrons: ______
3
How many energy shells will this have? ____
5
How many valence (outer) electrons does this element have? ____
Bohr Model:
Guided Practice
11
Na
Sodium
22.990
11
12
11
Protons: _____
Neutrons: _____
Electrons: ______
3
How many energy shells will this have? ____
1
How many valence (outer) electrons does this element have? ____
Bohr Model:
Drawing Lewis Dot Structures
Lewis Dot Structures are easier, all you
need are the number of valence
electrons.
Fluorine has 7 valence
electrons
Drawing Lewis Dot Structures
1.
Write the letter(s) for the element
to represent the nucleus.
F
Drawing Lewis Dot Structures
2.
Add the valence electrons in the
same way as Bohr models, go
clockwise
F
Guided Practice
6
Number of Valence Electrons: _____
Guided Practice
5
Number of Valence Electrons: _____
Guided Practice
1
Number of Valence Electrons: _____