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Evolution of the Atomic Model: 1924-1926PowerPoint Presentation

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. 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

- 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!

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?

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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