The Structure of Atoms Matching
Directions: On the line before each definition, write the letter of the term that matches it correctly. Not all terms
are used.
1. The part of an atom that contains most of
A. electron
its mass
B. nucleus
2. particle in the nucleus of an atom that has a
C. neutron
positive charge
D. electron cloud
3. particle of an atom that has a negative charge
E. ion
4. an atom that has a positive or negative charge
F. isotope
5. uncharged particle in the nucleus of an atom
G. proton
6. one of two or more atoms of an element that
have different numbers of neutrons
Multiple Choice
Directions: On the line before each statement, write the letter of the correct answer.
7. An element's atomic number tells the number of
A. isotopes it forms.
B. protons in the nucleus.
C. particles in the nucleus.
D. electrons it gains to form an ioli.
8. In an atom, electrons
A. are paired with protons.
B. are found within the nucleus.
C. stay in a region called the electron cloud.
D. orbit the nucleus like planets around the Sun.
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