Electron Shells Periods on the periodic table are similar because they have the same number of electron shells Within these shells there are layers called sublevels a shell can have between 1 and 4 sublevels ID: 639826
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Slide1
Electron Configuration for ElementsSlide2
Electron Shells
Periods on the periodic table are similar because they have the same number of electron shells.
Within these shells there are layers called sublevels', a shell can have between 1 and 4 sublevels.Slide3
Sublevels of Electron Shells
Sublevel
How
Many Electrons can it Hold?
s
2
p
6
d
10
f
14Slide4
Electrons Shells and their Sublevels
Shell or Period #
Sublevels
Allowed
1
s
2
s,
p
3
s, p, d
4
s,
p, d, f
5
s, p, d, f
6
s, p, d
7
s, pSlide5
Blocks on the Periodic Table
**the period and block an element lives in indicates the sublevel their final electrons are filling, that element will have full shells for all prior blocks.Slide6Slide7
Standard Notation
of Fluorine
Main Energy Level Numbers
1, 2, 2
Sublevels
Number of electrons
in the sub level
2,2,5
1
s
2
2
s
2 2p5Slide8
How is the electron configuration written?
Each row of an electron configuration table is sort of like a sentence. Each 'sentence' is made up of smaller 'words'. Each 'word' follows this format
:
The first number is the
energy level
. We can tell right away that an atom of gold contains 6 energy levels.
The lowercase letter is the
sub-shell
. The sub-shells are named s, p, d and f. The number of available sub-shells increases as the energy level increases. For example, the first energy level only contains an s sub-shell while the second energy level contains both an s sub-shell and a p sub-shell.
The number in superscript is the
number of electrons in a sub-shell
. Each sub-shell can hold only a certain number of electrons. The s sub-shell can hold no more than 2 electrons, the p sub-shell can hold 6, the d sub-shell can hold 10 and the f sub-shell can hold as many as 14.Slide9
Example:
The electron configuration for Nickel would look like:
1s
2
2s
2
2p
6
3s
2
3p
64s
23d8Slide10
You Try:
Write the full electron configuration for gallium.
1s
2
2s
2
2p
6
3s
2
3p
64s
23d104p1Slide11
One more…
Write the full electron configuration for palladium.
1s
2
2s
2
2p
6
3s
2
3p
64s
23d104p65s24d8 Slide12
Abbreviated vs. Unabbreviated Notation
Unabbreviated:
list all sub shells as we did in the previous examples
Abbreviated:
list the last noble gas prior to the element then all subshells that fall after this:
Example – abbreviated version of palladium:
[Kr]
5s
2
4d
8Slide13
Why is this important?
Understanding the electron configuration of an atom will help us identify what type of ion or compound an atom will typically form.Slide14
Electron Configuration Song
https://www.youtube.com/watch?v=Vb6kAxwSWgU