6 ◆ K
sections
1 Models of the Atom
2
The Simplest Matter
Lab Elements and the
Periodic Table
3
Compounds and Mixtures
Lab Mystery Mixtures
Virtual Lab Atoms, Elements,
Compounds, and Mixtures
What an impressive sight!
Have you ever seen iron on an atomic level?
This is an image of 48 iron atoms surround-
ing a single copper atom. In this chapter,
you will learn about scientists and their
discoveries about the nature of the atom.
Based on your knowledge,
describe what an atom is.
Science Journal
Atoms, Elements,
Compounds, and Mixtures
courtesy IBM
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K ◆ 7
Parts of the Atom Make the
following Foldable to help you
organize your thoughts and
review parts of an atom.
Collect two sheets of
paper and layer
them about 1.25 cm
apart vertically. Keep
the edges level.
Fold up the bottom
edges of the paper to
form four equal tabs.
Fold the papers and
crease well to hold
the tabs in place.
Staple along the
fold. Label the flaps
Atom, Electron, Proton,
and Neutron as shown.
Read and Write As you read the chapter,
describe how each part of the atom was discov-
ered and record other facts under the flaps.
STEP 3
STEP 2
STEP 1
Model the Unseen
Have you ever had a wrapped birthday pres-
ent that you couldn’t wait to open? What did
you do to try to figure out what was in it? The
atom is like that wrapped present. You want
to investigate it, but you cannot see it easily.
1. Your teacher will give you a piece of clay
and some pieces of metal. Count the
pieces of metal.
2. Bury these pieces in the modeling clay so
they can’t be seen.
3. Exchange clay balls with another group.
4. With a toothpick, probe the clay to find
out how many pieces of metal are in the
ball and what shape they are.
5. Think Critically In your Science Journal,
sketch the shapes of the metal pieces as
you identify them. How does the number
of pieces you found compare with the
number that were in the clay ball? How
do their shapes compare?
Start-Up Activities
Preview this chapter’s