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Chem 11 – Class StarterPowerPoint Presentation

Chem 11 – Class Starter

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Chem 11 – Class Starter

Please take out your Periodic Table “cut-ups” and place them on your table

If this makes more sense, why are periodic tables laid out the way they are?

Practicality…

Soon… this “alternative” model of the Periodic Table will become very important to us…

Intro to Quantum Mechanics will become very important to us…

Video

Where were were…? will become very important to us…

Collect the Quantum Revolution Worksheet from the front of the room

In about 8 minutes we will review as a class

Unfortunately… will become very important to us…

- Bohr’s model on worked for one specific molecule…
Hydrogen

- So what’s so unique about Hydrogen?
One electron system

- We can’t have a model that works for only one ATOM!

One more thing… Waves vs. Particles will become very important to us…

- Is light a wave or a particle?

- Is an electron a wave or a particle?

BOTH ARE BOTH!?!

Wave-Particle Duality will become very important to us…

Finally…. the MODERN MODEL of the atom will become very important to us…

It took several years, several scientists, and some outside the box thinking to develop the current model of the atom…

Video: NOVA - Quantum Mechanics - Probability Density will become very important to us…

Population Density of BC will become very important to us…

If you had to make a bet (non monetary of course) on finding a specific person, when you have no prior knowledge of where they live, where in BC would you choose?

Bohr Theory will become very important to us…

The electron is a particle that must be in orbital in the atom.

Quantum Theory

The electron is like a cloud of negative energy or a wave.

Orbitals are areas in 3D space where the electrons most probably are.

The energy of the electron is in its vibrational nodes- like notes on a guitar string.

Photons are produced when high energy nodes change to lower energy nodes

We now not only have shells… will become very important to us…

We now have subshells within shells…

Oh and by the way… even though they are called shells they are ACTUALLY probability densities

- S orbitals will become very important to us…
- Each orbital holds 2 electrons

- P orbitals will become very important to us…
- There are 3 suborbitals
- Each contains 2 electrons
- Total electrons = 6

- D orbitals will become very important to us…
- There are 5 suborbitals
- Each contains 2 electrons
- Total electrons = 10

- F orbitals will become very important to us…
- There are 7 suborbitals
- Each contains 2 electrons
- Total electrons = 14

7p electrons..

6d

5f

7s

n = 7

6p

5d

4f

6s

n = 6

5p

4d

5s

n = 5

4p

3d

4s

n = 4

3p

3s

Energy levels

n = 3

The Electron Energy Levels for a Polyeletronic Atom

2p

2s

n = 2

Energy Levels

n = 1

1s

Homework: electrons..

- Hebden: Read p. 151-157 Q’s 26-29 odds

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