rti Name ____________________________ Date ____________________ Class ____________
Elements and the Periodic Table
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Review & Reinforce Chemical Building Blocks
Introduction to Atoms: Chapter 3, Section 1
Understanding Ideas
1. Name three particles found in an atom.
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2. Which two particles are found in an atom’s nucleus?
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3. A neutrally charged atom has the same number of which two particles? ________________________________________________________________________
4. Which two particles define the atomic mass?
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5. Which particle identifies an atom as a specific element?
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6. What is the difference between atomic number and atomic mass.
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Building Vocabulary
Match each term with its definition by writing the letter of the correct definition on
the line beside the term in the left column.
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7. nucleus
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8. proton
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9. neutron
a. the sum of protons and neutrons in the nucleus of an atom
b. the very small center core of an atom
c. where the electrons roam free ____ 10. electron
____ 11. atomic number
____ 12. electron cloud d. the particle of an atom that moves rapidly around the nucleus
____ 13. mass number
e. an object that helps expain ideas about the natural world
____ 14. model
f. the particle of an atom with a positive charge
g. the number of protons in the nucleus of every atom of an element
h. the particle of an atom that is neutral
© Pearson Education, Inc., editted Edward Torgerson 2010.