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Section 3.1 What are elements?
Main Idea
Electrons in
Energy Levels
Use with page 56.
Details
Draw the figures below to help you understand isotopes and energy
levels in atoms. Use Figure 3-2 and information from your book to
help you.
1. Draw a chlorine-35 atom.
2. Label the nucleus with the
number of protons and
neutrons inside.
3. Circle the valence energy
level.
e–
e–
Isotopes
Use with page 57.
e–
e–
e–
e–
17 protons
18 neutrons
e–
e–
e–
e–
e–
e–
e–
e–
e–
e–
e–
1. Draw a chlorine-37 atom.
2. Label the nucleus with the
number of protons and
neutrons inside.
3. Circle the valence energy
level.
e–
e–
e–
e–
e–
e–
e–
17 protons
20 neutrons
e–
e–
e–
e–
e–
e–
e–
e–
e–
e–
e–
Name the relationship of the two atoms you drew above.
State if the two atoms would have the same properties, or not.
What elements
are most
abundant?
Use with page 58.
Analyze the circle graphs in Figure 3-4 in your text. Write the
chemical symbols for elements that match the following descriptions.
the 3 most common elements in Earth’s crust
the most abundant element in the universe
the element that makes up 5.0% of Earth’s crust
4 elements that are common both in the universe and in the earth’s
crust
S YNTHESIZE
Make a concept map to organize facts you have learned in this
section about elements.
28
Section 3.1 What are elements?