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Atomic Models
Bohr Model
Cloud Model
Bohr Model



Electrons orbit the nucleus in
definite orbits.
The orbits can hold only a specific
number of electrons.
Once a level is full, the electrons
start filling the next level.
Electron Level Limits:



1st Level = 2 electrons
2nd Level = 8 electrons
3rd Level = 8 electrons
Hydrogen:
+
-
Helium:
Lithium:
Beryllium
Cloud Model:


The electrons are in an area around
the nucleus called an electron
cloud.
There are enough electrons to
make the atom’s charge neutral
Hydrogen:
1P
0N
1E
Helium:
2P
2N
2E
Lithium
3P
3N
3E
Assignment:



Draw a Bohr Model and a Cloud
Model for the first 18 Atoms on the
Periodic Chart.
Include the Atomic Number and
Mass.
You may write rather than draw the
number of protons and neutrons
there are in the nucleus, but draw
all electrons for the bohr model.
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