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Unit 3: Matter Page 27
Exercises for Unit 3: Matter
Lesson 1: Atoms and Density Exercises
1. What is the smallest stable 5. What is an element?
building block of matter?
6. Where have almost all atoms
2. When you go swimming, what come from?
are you moving through?
7. What five elements are in all
3. What are three particles inside living things?
an atom?
8. True or false: Matter is made of
4. What makes one atom different hard, tightly packed, little particles.
from another?
9. What do you call a bunch of
atoms stuck together?
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