Bohr Rutherford Atomic Model

Bohr Rutherford Atomic Model

1. Bohr –Rutherford Atomic
Model
Objectives:
4.9To describe the simplified atomic
model currently in use (Bohr-
Rutherford)

2. Bohr & Rutherford combined their
theories to create the current
simplified atomic model
The atom is made up of three sub-
atomic particles:
Protons
Electrons
Neutrons
Bohr –Rutherford Atomic
Model:

3. The Atom:
Sub-Atomic
Particle
Charge Mass Location
Proton
Electron
Neutron
+
-
none
1 amu
negligible
1 amu
nucleus
outside
nucleus
nucleus

4. education.jlab.org/ qa/atom_model.html
The Atom:
nucleus
electron
neutron
proton

5. Nucleus:
Contains protons& neutrons
Overall positive charge (+)
Contains nearly all mass (dense)
Electrons:
Located outside
nucleus
Easily moved, lost
or gained
Negative charge (-)

6. Every atom has a symbol & two
numbers associated with it.
Ex.
The Atom –Important Info:
C
12
6
Atomic Mass
Atomic Number
•The mass of an atom
•The bigger number
•The number of protons & neutrons
•The number of protons
•The smaller number
Since atoms are neutral,
the number of protons (+)
equals the number of electrons (-)

7. For the following atom, state the…
i)atomic mass
ii)atomic number
iii)# of protons
iv)# of electrons
v)# of neutrons
O
16
8
16
8
8
8
16 –8 = 8

8. For the following atom, state the…
i)atomic mass
ii)atomic number
iii)# of protons
iv)# of electrons
v)# of neutrons
Na
23
11
23
11
11
11
23 –11 = 12

9. For the following atom, state the…
i)atomic mass
ii)atomic number
iii)# of protons
iv)# of electrons
v)# of neutrons
Ar
40
18
40
18
18
18
40 –18 = 22

10. Cu
64
29
64
29
29
29
64 –29 = 35
For the following atom, state the…
i)atomic mass
ii)atomic number
iii)# of protons
iv)# of electrons
v)# of neutrons

11. For the following atom, which
statement is TRUE?
P
31
15
A)The atomic number is 31.
B)The atom has 15 neutrons.
C)The atom has 16 electrons.
D)The atom has 15 protons & 15 electrons.

12. Given a neutral atom, which statement
is TRUE?
A)An atom always has the same number of
electrons as neutrons.
B)Electrons & neutrons are found in the
nucleus.
C)The atomic number states the number of
neutrons.
D)An atom always has the same number of
electrons as protons.

13. Atoms are made up of:
Protons
Electrons
Neutrons
Protons& Neutronsare located in
the nucleus
Electronsare located outsidethe
nucleus

14. An atom’s atomic number is equal to
the number of protons(smaller
number)
An atom is neutral, therefore the
number of protons & electrons are
equal
An atom’s atomic massis equal to
the protons & neutrons together
(bigger number)

15. Activities:
Physical Science Worksheet #7
Once you’ve
completed the
worksheet, continue
with the rest of the
lesson

16. Recall, in the Bohr-Rutherford atomic
model, electronsare located outside
the nucleus
Electrons are organized into:
Electron shells or
Energy levels or
Orbitals
Electrons:
Be familiar with
all the terms,
especially the
first two

17. Each electron shelldiffers in size &
the number of electrons it can hold
(capacity)
Electrons:
Electron
Shell
Capacity
1
st
2 electrons
2
nd
8 electrons
3
rd
8 electrons*
4
th
2 electrons*
Shows maximum #
of electrons in
each shell
Shells can be partially
filled or empty
*Simplified –
3
rd
shell holds 18 electrons
4
th
shell holds 32 electrons

18. Is a picture of an atom, showing its
protons, electrons & neutrons.
Ex.
Bohr –Rutherford Diagram:
Protons =
Electrons=
Neutrons=
3
3
4
3 P
+
4 N
0
2 e-1 e-
Li
7
3

19. Draw a Bohr-Rutherford diagram for:
Protons =
Electrons=
Neutrons=
9
9
10
9 P
+
10 N
0
2 e-7 e-
F
19
9

20. Draw a Bohr-Rutherford diagram for:
Protons =
Electrons=
Neutrons=
5
5
6
5 P
+
6 N
0
2 e-3 e-
B
11
5

21. Draw a Bohr-Rutherford diagram for:
Protons =
Electrons=
Neutrons=
12
12
12
12 P
+
12 N
0
2 e-8 e-
Mg
24
12
2 e-

22. Draw a Bohr-Rutherford diagram for:
Protons =
Electrons=
Neutrons=
19
19
20
19 P
+
20 N
0
2 e-8 e-
K
39
19
8 e-1 e-

23. Be
9
4
Which of the following diagrams best
represents the Bohr-Rutherford model of…
A)
4 P
+
5 N
0
2 e-
3 e-
B)
5 P
+
4 N
02 e-2 e-
C)
4 P
+
5 N
0
2 e-2 e-

24. Draw a Bohr-Rutherford diagram for
each of the following atoms:
P
31
15
N
14
7
Al
27
13
15 P
+
16 N
0
2 e-
8 e-
5 e-
7 P
+
7 N
0
2 e-
5 e-
13 P
+
14 N
0
2 e-
8 e-
3 e-

25. Electrons are located outside the
nucleus in electronshells
In the…
1
st
shell –2 electrons
2
nd
shell –8 electrons
3
rd
shell –8 electrons*
4
th
shell –2 electrons*
In Bohr-Rutherford diagrams:
Place Protons & Neutrons in nucleus
Place Electrons in appropriate shells
Find the
number of
Protons,
Electrons &
Neutrons

26. Activities:
Physical Science Worksheet #8

27. References
Student Study Guide –Physical
Science 416/436 -MEQ
Science Quest –Grenier, Daigle,
Rheaume –1998, Cheneliere
Google Images
Animation Factory