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NOVA: Hunting the Elements - Part 1
( http://www.pbs.org/wgbh/nova/physics/hunting-elements.html)
Gold
1. There are
unique substances (elements) arranged on an amazing chart that
reveals their hidden secrets to anyone who knows how to read it.
2. Gold has the element symbol of
.
3. All athe gold ever mined would fit into a single cube about
on a side.
feet
4. Three-quarters of the elements are
5. How much would a 60 pound block of gold be work in dollars?
6. Only a few natural elements hav a greater
than gold.
Copper
7. Copper has a symbol of
and has an atomic number of
8. Coppper is found in wires, electronics, computer chips,
building materials.
9. Copper conducts electricty better than any other metal except
.
and
.
The Alloys
10. When copper is combined with another element,
first manmade metal alloy.
11. Tin has the symbol of
, it makes bronze, the
and has an atomic number of
.
12. In pure metals the atoms are arranged in orderly rows and columns and within each
atom there’s a sea of moving electrons. It’s these free flowing
that
make metals conductive.
13. Because copper is soft and is easy to
it isn’t right for a bell.
14. Adding copper to tin changes the
of the metal.
15. One reason the Liberty Bell may have cracked is because it had to much
in the bronze.
16. If you use an electron microscope, you must zoom in
times to see an atom.
Atoms of bronze – light colored dots are atoms of Tin while dark colored dots are atoms of Copper.
17. Metals are
that have an orderly arrangement of atoms.
million