evolution of the atomic model: 1924-1926
DESCRIPTION
Evolution of the Atomic Model: 1924-1926. Williamsburg High School for Architecture and Design Mr. Quinn and Ms. Tom 10/9/13. Aim. How can we “fix” the Octet Rule? (TOPIC: How did the concept of the atom change in the early 1900s?). Remember the Bohr model!. The Bohr Model - PowerPoint PPT PresentationTRANSCRIPT
Evolution of the Atomic Model: 1924-1926
Williamsburg High School for Architecture and Design
Mr. Quinn and Ms. Tom10/9/13
AimHow can we “fix” the Octet Rule?
(TOPIC: How did the concept of the atom change in the early 1900s?)
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.
OK, but why are they stuck in orbits?
All matter is made of waves!
Well, you see...
Let’s take it back a step...
Artist’s Rendition
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???
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?
Each orbit is actually a bunch of subdivisions!
Row # Sublevels
ID Sublevels
1
2
3
4
Sublevel # Orbitals Electrons/ orbital
Total Electrons
s
p
d
f
How do we fill them?
1s
2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f
How do we write that?
● He
● Be
● F
● Mg
● Cl
● Ca
● Br
● Ag
Does that fix our problem?
● How many electrons did we expect to have in the outer shell of Br?
● How many did we get?
MORE PRACTICE!