Electron configuration methods
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Transcript of Electron configuration methods
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Writing Electron Configurations
Three ways to do it
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First, a clever look at the atom
Atom NOVA
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The Way That Almost Forced Me from Chemistry
Actually, it's not so bad,
and millions find it their
favorite method.
Try it with Na, Cl and Fe. . .
Aufbau rule: electrons always occupy the lowest energy level available. Find it on this diagram.
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The Periodic Table Method
From U.Cal Davis
1
2
3
4
5
6
7
s pd
f
n-1
n-2
n
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The Verbal Memory Method
This takes a while, but it's a good check on the other methods
Memorize 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
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Exceptions
There is a “pull” toward half-filled and completely filled degenerate orbitals: lower energy state than the alternative
Example: 4s2 and 3d9 vs 4s1 and 3d10
This works with ions as well: explains Ag+
Always think: what if we took one, two or three electrons away from this atom
And, what if we add electrons to this non-metal