Student Name: ____________________________________________
Period: _________
Score: __________________
Practicing Bohr Models Worksheet
Steps to Complete a Bohr Model:
Step 1: Determine which element you have? ___________________
Step 2: Determine the number of each subatomic particle you have:
#p+ _________
#e- __________
#n0 __________
Knowing the mass number and the atomic number (aka #p+),
you can now determine the number of neutrons:
mass # - atomic # = #n0 {Remember: #p+ = #e-}
Example Guide
Step 3: Filling in the Bohr Model
Protons and Neutrons belong in the middle like:
Electrons are placed in the orbitals around the middle. Each line represents a quantum orbital level.
so:
n=1 = max 2e-
n=2 = max 8e-
n=3 = max 16e-
n=4 = max 32e-
Place the “maximum” allowable electrons in each quantum level, until the number of electrons for the isotope
is represented. Follow the example.
For Practice, Complete the following Bohr Models. Remember to ask if you have questions!!
1
1
H
4
2
He
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____
7
3
Li
23
11
Na
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____
35
17
64
29 Cu
Cl
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____
14
6
C
26
14
Si
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____
41
19 K
55
26
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____
63
33
106
53 I
As
Fe
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____
22
10
Ne
133
55 Cs
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____
24
12
Mg
18
8
O
#Protons = _____
#Protons = _____
#Neutrons = _____
#Neutrons = _____
#Electrons = _____
#Electrons = _____