What we have not considered yet is how atoms of different elements interact to form compounds substances that have more than one element. In Chapter 4 we will take up this subject and much more. What properties indicate that a substance is metallic? Why are metals shiny? How can metallic properties be explained by the atomic-molecular structure of Al for example? Why can we see through diamond but not aluminum?
How about graphite? Why does aluminum and for that matter all metals conduct electricity? What must be happening at the atomic-molecular scale for this to occur?
How do the bonding models for diamond and graphite explain the differences in properties between diamond, graphite, and a metal like aluminum? Why is it OK to use different models to describe bonding in different species? Why Does Saturn Tilt? Two scientists from France have figured out why Saturn sits at a tilt. And they say that over the next few billion years FEB 10, According to the Tagging is how all of our articles, products and events are related to each other.
You can explore tags individually by clicking on them, or by searching for them on our website. To learn more, click here. Upcoming Webinars. You also asked another question about how impinging EM waves cause charges to move when they "don't contain any charges". The answer to this is that charges don't respond to other charges , they respond to EM fields. It is thus by producing an EM field that charges "respond to other charges", but they only directly respond to the field itself which is very important to understand if you want to understand EM waves, since the same principle also applies to changes in the field: a change in the field only affects the field immediately next to that, not immediately a distant charge, and thus a wave propagates.
Since an EM wave is composed of electric and magnetic fields, when it impinges upon charges they will react to it because, as said, they respond to fields. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. Why are some materials dull rather than shiny cloth, coal, matte paint etc. Ask Question. Asked 3 years, 10 months ago. Active 3 years, 10 months ago. Viewed 1k times. There are so many questions here but any help is greatly appreciated! Improve this question. Add a comment. Light waves are made up of electric and magnetic fields.
When a light wave hits a metallic surface, the electrons on the surface are pushed and pulled by the field of the incoming wave. How far do they go? They slosh around until the field that they create after all, electrons are charged and they make their own field cancels out the incoming field exactly.
They stop when the net force is zero on them. This means that the electric field inside a conducting metal is zero.
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