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Electron Configuration Notes
Main Idea:
Electron configurations are like “addresses” for
electrons describing which shells and subshells an
atom’s electrons are in when they are in their
ground state
...


In order to write an electron configuration, you need to
know the different kinds of sublevels and their locations
on the periodic table
...
The d sublevel
is the level of transverse electrons which starts at the
level 3d which can be confusing due to the s level prior
to it being 4s
...
The s
level contains a maximum of two
...
The d level has a maximum of ten and
the f level has a maximum of fourteen
...
You read it
row by row
...

Fluorine:

Fluorine is number nine on the periodic table
...
This is

because when it is read row by row 1s would come
first then 2s then 2p, not 3d
...
This is a reminder to always
read row by row, not column by column
...


Aluminum:

This configuration should be 1s² 2s² 2p⁶ 3s² 3p¹

A good way to check your configuration would be to add
up the exponents to see if they are the atomic number of
the atom
...

Noble Gas (Condensed) Configurations
Some electron configurations will be longer as the
configurations do get longer as you increase the atomic
number
...


The noble gases, which are located in row eight of the
periodic table, are used to shorten the configuration
...


Nitrogen (7):
1s² 2s² 2p3
[He] 2s2 2p3
Why?: When you count the configurations, you pass
the noble gas, Helium, if you went further and
passed the next noble gas, that would have become
the shortcut
...


Titanium (22):
1s2 2s2 2p6 3s2 3p6 4s2 3d2
[Ar] 4s2 3d2
Why?: Argon is the closest noble gas the counting
passed on the periodic table, so it became the
shortcut in this case
...


1
...
Nitrogen
b
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Sulfur
d
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Write a complete electron configuration for an atom
of the following:
a
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Silicon
c
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Argon
3
...
Magnesium
b
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Aluminum
d
...
Write an abbreviated electron configuration for an
atom of the following:
a
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Silicon
c
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Oxygen
5
...
1s2 2s1
b
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[Ne] 3s2 3p2
d
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Give the symbol of the element of the following
configurations:
a
...
[Ne] 3s2
c
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[Ne] 3s2 3p1

Answer Key
1
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1s2 2s2
b
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1s2 2s2
d
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1s2 2s2
b
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1s2 2s2
d
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3
...
[Ne]
b
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[Ne]
d
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[Ne]
b
...
[Ne]
d
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5
...
Li
b
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Si
d
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a
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Mg

c
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Al



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