Download - Evolution of the Atomic Model: 1924-1926
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Evolution of the Atomic Model: 1924-1926
Williamsburg High School for Architecture and Design
Mr. Quinn and Ms. Tom10/9/13
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AimHow can we “fix” the Octet Rule?
(TOPIC: How did the concept of the atom change in the early 1900s?)
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Remember the Bohr model!
The Bohr Model● The electrons were
confined into clearly
defined orbits.
● They could jump between
these orbits, but could not
freely spiral inward or
outward in intermediate
states.
● An electron must absorb
or emit specific amounts
of energy for transition
between these fixed orbits.
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OK, but why are they stuck in orbits?
All matter is made of waves!
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Well, you see...
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Let’s take it back a step...
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Artist’s Rendition
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Those waves are all over the place!
That’s why orbits are the most likely location of electrons in the atom!
How do all those waves loop around each other???
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Think back...
● How many electrons can the first shell hold?○ What does that correspond to on the periodic
table?
● How many electrons can the second shell hold?○ What does that correspond to on the periodic
table?
● Which elements was the octet rule funky for?○ What does that correspond to on the periodic
table?
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Each orbit is actually a bunch of subdivisions!
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Row # Sublevels
ID Sublevels
1
2
3
4
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Sublevel # Orbitals Electrons/ orbital
Total Electrons
s
p
d
f
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How do we fill them?
1s
2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f
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How do we write that?
● He
● Be
● F
● Mg
● Cl
● Ca
● Br
● Ag
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Does that fix our problem?
● How many electrons did we expect to have in the outer shell of Br?
● How many did we get?
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MORE PRACTICE!