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Chem 11 – Class StarterPowerPoint Presentation

Chem 11 – Class Starter

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Chem 11 – Class Starter

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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…

Video

Collect the Quantum Revolution Worksheet from the front of the room

In about 8 minutes we will review as a class

- 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!

- Is light a wave or a particle?

- Is an electron a wave or a particle?

BOTH ARE BOTH!?!

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

Population Density of BC

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

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 have subshells within shells…

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

- S orbitals
- Each orbital holds 2 electrons

- P orbitals
- There are 3 suborbitals
- Each contains 2 electrons
- Total electrons = 6

- D orbitals
- There are 5 suborbitals
- Each contains 2 electrons
- Total electrons = 10

- F orbitals
- There are 7 suborbitals
- Each contains 2 electrons
- Total electrons = 14

7p

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

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