# DDC Chapter 4

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# Links for the Fourth Chapter

## Extra Help For Chapter 4

The entire video is interesting, because it is about a guy who recreated Thomas Young’s experiment and showed it to people in the community. However, the most important part starts at 4:15. He uses waves on a pond to demonstrate how the waves of light interfere in Young’s experiment. It is a great visual.

There is no sound to this video, but it shows how all the orbitals in Scandium (element 21) are arranged. If you are having trouble imagining how all the orbitals fit together in an atom, this will help.

This video discusses why we think light is a bit like a particle and a bit like a wave.

This video discusses why we think electrons can be either a particle or a wave.

This video goes through five elements, giving you their electron configurations. The teacher uses the abbreviated form for all but the first. There is also a corny joke at the end.

This is the first of two videos that explain electron configurations.

This is the second of two videos that explain electron configurations.

This video draws the Lewis structure for chlorine and then discusses what it does to become an ion.

This video gives four examples of Lewis structures for ionic compounds.

This video gives examples of determining the formuals for ionic compounds. It also shows the Lewis structures that result.

## Interesting Links Related to Chapter 4

This video gives an introduction to the periodic table and discusses how it has been refined over the years.

This video goes into orbitals in more depth.

Lots of Atomic Orbitals
This table gives you the shapes of lots of orbitals. The number “n” just refers to the energy level. When l = 0, it is an s orbital. When l = 1, they are p orbitals. When l = 2, they are d orbitals. When l = 3, they are f orbitals. When l = 4, they are g orbitals. When l = 5, they are h orbitals. When l = 6, they are i orbitals.

This talk is interesting, mostly because it is Schrodinger himself talking.

## Extra Problems for Chapter 4

Extra problems for Chapter 4
This gives you more practice on the problems in chapter 4. Here are the solutions.